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Author Dawson, RI.; Huang, CLX.; Brahm, R.; Collins, KA.; Hobson, MJ.; Jordan, A.; Dong, JY.; Korth, J.; Trifonov, T.; Abe, L.; Agabi, A.; Bruni, I.; Butler, RP.; Barbieri, M.; Collins, KI.; Conti, DM.; Crane, JD.; Crouzet, N.; Dransfield, G.; Evans, P.; Espinoza, N.; Gan, TJ.; Guillot, T.; Henning, T.; Lissauer, JJ.; Jensen, ELN.; Sainte, WM.; Mekarnia, D.; Myers, G.; Nandakumar, S.; Relles, HM.; Sarkis, P.; Torres, P.; Shectman, S.; Schmider, FX.; Shporer, A.; Stockdale, C.; Teske, J.; Triaud, AHMJ.; Wang, SX.; Ziegler, C.; Ricker, G.; Vanderspek, R.; Latham, DW.; Seager, S.; Winn, J.; Jenkins, JM.; Bouma, LG.; Burt, JA.; Charbonneau, D.; Levine, AM.; McDermott, S.; McLean, B.; Rose, ME.; Vanderburg, A.; Wohler, B.
Title Precise Transit and Radial-velocity Characterization of a Resonant Pair: The Warm Jupiter TOI-216c and Eccentric Warm Neptune TOI-216b Type
Year 2021 Publication Astronomical Journal Abbreviated Journal Astron. J.
Volume 161 Issue 4 Pages 161
Keywords
Abstract TOI-216 hosts a pair of warm, large exoplanets discovered by the TESS mission. These planets were found to be in or near the 2:1 resonance, and both of them exhibit transit timing variations (TTVs). Precise characterization of the planets' masses and radii, orbital properties, and resonant behavior can test theories for the origins of planets orbiting close to their stars. Previous characterization of the system using the first six sectors of TESS data suffered from a degeneracy between planet mass and orbital eccentricity. Radial-velocity measurements using HARPS, FEROS, and the Planet Finder Spectrograph break that degeneracy, and an expanded TTV baseline from TESS and an ongoing ground-based transit observing campaign increase the precision of the mass and eccentricity measurements. We determine that TOI-216c is a warm Jupiter, TOI-216b is an eccentric warm Neptune, and that they librate in 2:1 resonance with a moderate libration amplitude of deg, a small but significant free eccentricity of for TOI-216b, and a small but significant mutual inclination of 12-39 (95% confidence interval). The libration amplitude, free eccentricity, and mutual inclination imply a disturbance of TOI-216b before or after resonance capture, perhaps by an undetected third planet.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0004-6256 ISBN Medium
Area Expedition Conference
Notes WOS:000625759900001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1363
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Author Dong, J.Y.; Huang, C.X.; Dawson, R.I.; Foreman-Mackey, D.; Collins, K.A.; Quinn, S.N.; Lissauer, J.J.; Beatty, T.; Quarles, B.; Sha, L.Z.; Shporer, A.; Guo, Z.; Kane, S.R.; Abe, L.; Barkaoui, K.; Benkhaldoun, Z.; Brahm, R.; Bouchy, F.; Carmichael, T.W.; Collins, K.I.; Conti, D.M.; Crouzet, N.; Dransfield, G.; Evans, P.; Gan, T.J.; Ghachoui, M.; Gillon, M.; Grieves, N.; Guillot, T.; Hellier, C.; Jehin, E.; Jensen, E.L.N.; Jordan, A.; Kamler, J.; Kielkopf, J.F.; Mekarnia, D.; Nielsen, L.D.; Pozuelos, F.J.; Radford, D.J.; Schmider, F.X.; Schwarz, R.P.; Stockdale, C.; Tan, T.G.; Timmermans, M.; Triaud, A.H.M.J.; Wang, G.; Ricker, G.; Vanderspek, R.; Latham, D.W.; Seager, S.; Winn, J.N.; Jenkins, J.M.; Mireles, I.; Yahalomi, D.A.; Morgan, E.H.; Vezie, M.; Quintana, E.V.; Rose, M.E.; Smith, J.C.; Shiao, B.
Title Warm Jupiters in TESS Full-frame Images: A Catalog and Observed Eccentricity Distribution for Year 1 Type
Year 2021 Publication Astrophysical Journal Supplement Series Abbreviated Journal Astrophys. J. Suppl. Ser.
Volume 255 Issue 1 Pages 6
Keywords TRANSITING BROWN DWARFS; IN-SITU FORMATION; METAL-RICH STARS; HOT JUPITERS; GIANT PLANETS; IDENTIFYING EXOPLANETS; ORBITAL MIGRATION; INPUT CATALOG; LIGHT CURVES; SUPER-EARTHS
Abstract Warm Jupiters-defined here as planets larger than 6 Earth radii with orbital periods of 8-200 days-are a key missing piece in our understanding of how planetary systems form and evolve. It is currently debated whether Warm Jupiters form in situ, undergo disk or high-eccentricity tidal migration, or have a mixture of origin channels. These different classes of origin channels lead to different expectations for Warm Jupiters' properties, which are currently difficult to evaluate due to the small sample size. We take advantage of the Transiting Exoplanet Survey Satellite (TESS) survey and systematically search for Warm Jupiter candidates around main-sequence host stars brighter than the TESS-band magnitude of 12 in the full-frame images in Year 1 of the TESS Prime Mission data. We introduce a catalog of 55 Warm Jupiter candidates, including 19 candidates that were not originally released as TESS objects of interest by the TESS team. We fit their TESS light curves, characterize their eccentricities and transit-timing variations, and prioritize a list for ground-based follow-up and TESS Extended Mission observations. Using hierarchical Bayesian modeling, we find the preliminary eccentricity distributions of our Warm-Jupiter-candidate catalog using a beta distribution, a Rayleigh distribution, and a two-component Gaussian distribution as the functional forms of the eccentricity distribution. Additional follow-up observations will be required to clean the sample of false positives for a full statistical study, derive the orbital solutions to break the eccentricity degeneracy, and provide mass measurements.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0067-0049 ISBN Medium
Area Expedition Conference
Notes WOS:000667476100001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1439
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Author Grieves, N.; Bouchy, F.; Lendl, M.; Carmichael, T.; Mireles, I.; Shporer, A.; McLeod, K.K.; Collins, K.A .; Brahm, R.; Stassun, K.G.; Gill, S.; Bouma, L.G.; Guillot, T.; Cointepas, M.; Dos Santos, L.A.; Casewell, S.L.; Jenkins, J.M.; Henning, T.; Nielsen, L.D. Psaridi, A.; Udry, S.; Segransan, D.; Eastman, J.D.; Zhou, G.; Abe, L.; Agabi, A.; Bakos, G.; Charbonneau, D.; Collins, K.I.; Colon, K.D.; Crouzet, N.; Dransfield, G.; Evans, P.; Goeke, R.F.; Hart, R:, Irwin, J.M.; Jensen, E.L.N.; Jordan, A.; Kielkopf, J.F.; Latham, D.W.; Marie-Sainte, W:, Mekarnia, D.; Nelson, P.; Quinn, S.N.; Radford, D.J.; Rodriguez, D.R.; Rowden, P.; Schmider, F.X.; Schwarz, R.P.; Smith, J.C.; Stockdale, C.; Suarez, O.; Tan, T.G.; Triaud, A.H.M.J.; Waalkes, W.; Wingham, G.
Title Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit Type
Year 2021 Publication Astronomy & Astrophysics Abbreviated Journal Astron. Astrophys.
Volume 652 Issue Pages
Keywords brown dwarfs; stars; low-mass; binaries: eclipsing
Abstract We report the discovery of five transiting companions near the hydrogen-burning mass limit in close orbits around main sequence stars originally identified by the Transiting Exoplanet Survey Satellite (TESS) as TESS objects of interest (TOIs): TOI-148, TOI-587, TOI-681, TOI-746, and TOI-1213. Using TESS and ground-based photometry as well as radial velocities from the CORALIE, CHIRON, TRES, and FEROS spectrographs, we found the companions have orbital periods between 4.8 and 27.2 days, masses between 77 and 98 M-Jup , and radii between 0.81 and 1.66 R-Jup . These targets have masses near the uncertain lower limit of hydrogen core fusion (similar to 73-96 M-Jup ), which separates brown dwarfs and low-mass stars. We constrained young ages for TOI-587 (0.2 +/- 0.1 Gyr) and TOI-681 (0.17 +/- 0.03 Gyr) and found them to have relatively larger radii compared to other transiting companions of a similar mass. Conversely we estimated older ages for TOI-148 and TOI-746 and found them to have relatively smaller companion radii. With an effective temperature of 9800 +/- 200 K, TOI-587 is the hottest known main-sequence star to host a transiting brown dwarf or very low-mass star. We found evidence of spin-orbit synchronization for TOI-148 and TOI-746 as well as tidal circularization for TOI-148. These companions add to the population of brown dwarfs and very low-mass stars with well measured parameters ideal to test formation models of these rare objects, the origin of the brown dwarf desert, and the distinction between brown dwarfs and hydrogen-burning main sequence stars.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0004-6361 ISBN Medium
Area Expedition Conference
Notes WOS:000686774100006 Approved
Call Number UAI @ alexi.delcanto @ Serial 1461
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Author Kossakowski, D.; Espinoza, N.; Brahm, R.; Jordan, A.; Henning, T.; Rojas, F.; Kurster, M.; Sarkis, P.; Schlecker, M.; Pozuelos, F.J.; Barkaoui, K.; Jehin, E.; Gillon, M.; Matthews, E.; Horch, E.P.; Ciardi, D.R.; Crossfield, I.J.M.; Gonzales, E.; Howell, S.B.; Matson, R.; Schlieder, J.; Jenkins, J.; Ricker, G.; Seager, S.; Winn, J.N.; Li, J.; Rose, M.E.; Smith, J.C.; Dynes, S.; Morgan, E.; Villasenor, J.N.; Charbonneau, D.; Jaffe, T.; Yu, L.; Bakos, G.; Bhatti, W.; Bouchy, F.; Collins, K.A.; Collins, K.I.; Csubry, Z.; Evans, P.; Jensen, E.L.N.; Lovis, C.; Marmier, M.; Nielsen, L.D.; Osip, D.; Pepe, F.; Relles, H.M.; Segransan, D.; Shporer, A.; Stockdale, C.; Suc, V.; Turner, O.; Udry, S.
Title TOI-150b and TOI-163b: two transiting hot Jupiters, one eccentric and one inflated, revealed by TESS near and at the edge of the JWST CVZ Type
Year 2019 Publication Monthly Notices Of The Royal Astronomical Society Abbreviated Journal Mon. Not. Roy. Astron. Soc.
Volume 490 Issue 1 Pages 1094-1110
Keywords techniques: photometric; planets and satellites: detection; stars: individual: HD271181; stars: individual: TIC 179317684; stars: individual: TIC 271893367; stars: individual: TYC9191-519-1
Abstract We present the discovery of TYC9191-519-1b (TOI-150b, TIC 271893367) and HD271181b (TOI-163b, TIC 179317684), two hot Jupiters initially detected using 30-min cadence Transiting Exoplanet Survey Satellite (TESS) photometry from Sector 1 and thoroughly characterized through follow-up photometry (CHAT, Hazelwood, LCO/CTIO, El Sauce, TRAPPIST-S), high-resolution spectroscopy (FEROS, CORALIE), and speckle imaging (Gemini/DSSI), confirming the planetary nature of the two signals. A simultaneous joint fit of photometry and radial velocity using a new fitting package JULIET reveals that TOI-150b is a 1.254 +/- 0.016 R-J, massive (2.61(-0.12)(+0.19) M-J) hot Jupiter in a 5.857-d orbit, while TOI-163b is an inflated (R-P = 1.478(-0.029)(+0.022) R-J, M-P = 1.219 +/- 0.11 M-J) hot Jupiter on a P = 4.231-d orbit; both planets orbit F-type stars. A particularly interesting result is that TOI-150b shows an eccentric orbit (e = 0.262(-0.037)(+0.045)), which is quite uncommon among hot Jupiters. We estimate that this is consistent, however, with the circularization time-scale, which is slightly larger than the age of the system. These two hot Jupiters are both prime candidates for further characterization – in particular, both are excellent candidates for determining spin-orbit alignments via the Rossiter-McLaughlin (RM) effect and for characterizing atmospheric thermal structures using secondary eclipse observations considering they are both located closely to the James Webb Space Telescope (JWST) Continuous Viewing Zone (CVZ).
Address [Kossakowski, Diana; Espinoza, Nestor; Henning, Thomas; Kuerster, Martin; Sarkis, Paula; Schlecker, Martin] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany, Email: kossakowski@mpia.dc
Corporate Author Thesis
Publisher Oxford Univ Press Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0035-8711 ISBN Medium
Area Expedition Conference
Notes WOS:000496922300078 Approved
Call Number UAI @ eduardo.moreno @ Serial 1076
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Author Nielsen, L.D.; Brahm, R.; Bouchy, F.; Espinoza, N.; Turner, O.; Rappaport, S.; Pearce, L.; Ricker, G.; Vanderspek, R.; Latham, D.W.; Seager, S.; Winn, J.N.; Jenkins, J.M.; Acton, J.S.; Bakos, G.; Barclay, T.; Barkaoui, K.; Bhatti, W.; Briceno, C.; Bryant, E.M.; Burleigh, M.R.; Ciardi, D.R.; Collins, K.A.; Collins, K.I.; Cooke, B.F.; Csubry, Z.; dos Santos, L.A.; Eigmuller, P.; Fausnaugh, M.M.; Gan, T.; Gillon, M.; Goad, M.R.; Guerrero, N.; Hagelberg, J.; Hart, R.; Henning, T.; Huang, C.X.; Jehin, E.; Jenkins, J.S.; Jordan, A.; Kielkopf, J.F.; Kossakowski, D.; Lavie, B.; Law, N.; Lendl, M.; de Leon, J.P.; Lovis, C.; Mann, A.W.; Marmier, M.; McCormac, J.; Mori, M.; Moyano, M.; Narita, N.; Osip, D.; Otegi, J.F.; Pepe, F.; Pozuelos, F.J.; Raynard, L.; Relles, H.M.; Sarkis, P.; Segransan, D.; Seidel, J.V.; Shporer, A.; Stalport, M.; Stockdale, C.; Suc, V.; Tamura, M.; Tan, T.G.; Tilbrook, R.H.; Ting, E.B.; Trifonov, T.; Udry, S.; Vanderburg, A.; Wheatley, P.J.; Wingham, G.; Zhan, Z.; Ziegler, C.
Title Three short-period Jupiters from TESS: HIP 65Ab, TOI-157b, and TOI-169b Type
Year 2020 Publication Astronomy & Astrophysics Abbreviated Journal Astron. Astrophys.
Volume 639 Issue Pages 17 pp
Keywords planets and satellites: detection; planets and satellites: individual: TOI-129; planets and satellites: individual: HIP 65A; planets and satellites: individual: TOI-157
Abstract We report the confirmation and mass determination of three hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HIP 65Ab (TOI-129, TIC-201248411) is an ultra-short-period Jupiter orbiting a bright (V = 11.1 mag) K4-dwarf every 0.98 days. It is a massive 3.213 +/- 0.078 M-J planet in a grazing transit configuration with an impact parameter of b = 1.17(-0.08)(+0.10) b=1.17-0.08+0.10 . As a result the radius is poorly constrained, 2.03(-0.49)(+0.61)R(J) 2.03-0.49+0.61 RJ . The planet's distance to its host star is less than twice the separation at which it would be destroyed by Roche lobe overflow. It is expected to spiral into HIP 65A on a timescale ranging from 80 Myr to a few gigayears, assuming a reduced tidal dissipation quality factor of Q(s)(') = 10(7) – 10(9) Qs ' =107-109 . We performed a full phase-curve analysis of the TESS data and detected both illumination- and ellipsoidal variations as well as Doppler boosting. HIP 65A is part of a binary stellar system, with HIP 65B separated by 269 AU (3.95 arcsec on sky). TOI-157b (TIC 140691463) is a typical hot Jupiter with a mass of 1.18 +/- 0.13 M-J and a radius of 1.29 +/- 0.02 R-J. It has a period of 2.08 days, which corresponds to a separation of just 0.03 AU. This makes TOI-157 an interesting system, as the host star is an evolved G9 sub-giant star (V = 12.7). TOI-169b (TIC 183120439) is a bloated Jupiter orbiting a V = 12.4 G-type star. It has a mass of 0.79 +/- 0.06 M-J and a radius of 1.09(-0.05)(+0.08)R(J) 1.09-0.05+0.08<mml:msub>RJ . Despite having the longest orbital period (P = 2.26 days) of the three planets, TOI-169b receives the most irradiation and is situated on the edge of the Neptune desert. All three host stars are metal rich with [Fe / H] ranging from 0.18 to0.24.
Address [Nielsen, L. D.; Bouchy, F.; Turner, O.; dos Santos, L. A.; Hagelberg, J.; Lavie, B.; Lendl, M.; Lovis, C.; Marmier, M.; Otegi, J. F.; Pepe, F.; Segransan, D.; Seidel, J., V; Stalport, M.; Udry, S.] Univ Geneva, Geneva Observ, Chemin Mailettes 51, CH-1290 Versoix, Switzerland, Email: louise.nielsen@unige.ch
Corporate Author Thesis
Publisher Edp Sciences S A Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1432-0746 ISBN Medium
Area Expedition Conference
Notes WOS:000554478300001 Approved
Call Number UAI @ eduardo.moreno @ Serial 1215
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Author Osborn, A.; Armstrong, D.J.; Cale, B.; Brahm, R.; Wittenmyer, R.A.; Dai, F.; Crossfield, I.J.M.; Bryant, E.M.; Adibekyan, V.; Cloutier, R.; Collins, K.A.; Mena, E.D.; Fridlund, M.; Hellier, C.; Howell, S.B.; King, G.W.; Lillo-Box, J.; Otegi, J.; Sousa, S.; Stassun, K.G.; Matthews, E.C.; Ziegler, C.; Ricker, G.; Vanderspek, R.; Latham, D.W.; Seager, S.; Winn, J.N.; Jenkins, J.M.; Acton, J.S.; Addison, B.C.; Anderson, D.R.; Ballard, S.; Barrado, D.; Barros, S.C.C.; Batalha, N.; Bayliss, D.; Barclay, T.; Benneke, B.; Berberian, J.; Bouchy, F.; Bowler, B.P.; Briceno, C.; Burke, C.J.; Burleigh, M.R.; Casewell, S.L.; Ciardi, D.; Collins, K.I.; Cooke, B.F.; Demangeon, O.D.S.; Diaz, R.F.; Dorn, C.; Dragomir, D.; Dressing, C.; Dumusque, X.; Espinoza, N.; Figueira, P.; Fulton, B.; Furlan, E.; Gaidos, E.; Geneser, C.; Gill, S.; Goad, M.R.; Gonzales, E.J.; Gorjian, V.; Gunther, M.N.; Helled, R.; Henderson, B.A.; Henning, T.; Hogan, A.; Hojjatpanah, S.; Horner, J.; Howard, A.W.; Hoyer, S.; Huber, D.; Isaacson, H.; Jenkins, J.S.; Jensen, E.L.N.; Jordan, A.; Kane, S.R.; Kidwell, R.C.; Kielkopf, J.; Law, N.; Lendl, M.; Lund, M.; Matson, R.A.; Mann, A.W.; McCormac, J.; Mengel, M.W.; Morales, F.Y.; Nielsen, L.D.; Okumura, J.; Osborn, H.P.; Petigura, E.A.; Plavchan, P.; Pollacco, D.; Quintana, E.V.; Raynard, L.; Robertson, P.; Rose, M.E.; Roy, A.; Reefe, M.; Santerne, A.; Santos, N.C.; Sarkis, P.; Schlieder, J.; Schwarz, R.P.; Scott, N.J.; Shporer, A.; Smith, A.M.S.; Stibbard, C.; Stockdale, C.; Strom, P.A.; Twicken, J.D.; Tan, T.G.; Tanner, A.; Teske, J.; Tilbrook, R.H.; Tinney, C.G.; Udry, S.; Villasenor, J.N.; Vines, J.I.; Wang, S.X.; Weiss, L.M.; West, R.G.; Wheatley, P.J.; Wright, D.J.; Zhang, H.; Zohrabi, F.
Title TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet Type
Year 2021 Publication Monthly Notices Of The Royal Astronomical Society Abbreviated Journal Mon. Not. Roy. Astron. Soc.
Volume 507 Issue 2 Pages 2782-2803
Keywords planets and satellites: detection; planets and satellites: fundamental parameters; planets and satellites: individual: (TOI-431, TIC 31374837)
Abstract We present the bright (V-mag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 +/- 0.7 d using archival photometry and RVs. Transiting Exoplanet Survey Satellite (TESS) objects of Interest (TOI)-431b is a super-Earth with a period of 0.49 d, a radius of 1.28 +/- 0.04 R-circle plus, a mass of 3.07 +/- 0.35 M-circle plus, and a density of 8.0 +/- 1.0 g cm(-3); TOI-431 d is a sub-Neptune with a period of 12.46 d, a radius of 3.29 +/- 0.09 R-circle plus, a mass of M-circle plus, and a density of 1.36 +/- 0.25 g cm(-3). We find a third planet, TOI-431c, in the High Accuracy Radial velocity Planet Searcher RV data, but it is not seen to transit in the TESS light curves. It has an Msin i of M-circle plus, and a period of 4.85 d. TOI-431d likely has an extended atmosphere and is one of the most well-suited TESS discoveries for atmospheric characterization, while the super-Earth TOI-431b may be a stripped core. These planets straddle the radius gap, presenting an interesting case-study for atmospheric evolution, and TOI-431b is a prime TESS discovery for the study of rocky planet phase curves.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0035-8711 ISBN Medium
Area Expedition Conference
Notes WOS:000697380800082 Approved
Call Number UAI @ alexi.delcanto @ Serial 1485
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Author Psaridi, A.; Bouchy, F.; Lendl, M.; Grieves, N.; Stassun, K.G.; Carmichael, T.; Gill, S.; Rojas, P.A.P.; Gan, T.J.; Shporer, A.; Bieryla, A.; Brahm, R.; Christiansen, J.L.; Crossfield, I.J.M.; Galland, F.; Hooton, M.J.; Jenkins, J.M.; Jenkins, J.S.; Latham, D.W.; Lund, M.B.; Rodriguez, J.E.; Ting, E.B.; Udry, S.; Ulmer-Moll, S.; Wittenmyer, R.A.; Zhang, Y.Z.; Zhou, G.; Addison, B.; Cointepas, M.; Collins, K.A.; Collins, K.I.; Deline, A.; Dressing, C.D.; Evans, P.; Giacalone, S.; Heitzmann, A.; Mireles, I.; Mounzer, D.; Otegi, J.; Radford, D.J.; Rudat, A.; Schlieder, J.E.; Schwarz, R.P.; Srdoc, G.; Stockdale, C.; Suarez, O.; Wright, D.J.; Zhao, Y.A.
Title Three new brown dwarfs and a massive hot Jupiter revealed by TESS around early-type stars Type
Year 2022 Publication Astronomy & Astrophysics Abbreviated Journal Astron. Astrophys.
Volume 664 Issue Pages A94
Keywords brown dwarfs; planetary systems; techniques: photometric; techniques: radial velocities; stars: early-type; binaries: eclipsing
Abstract ontext. The detection and characterization of exoplanets and brown dwarfs around massive AF-type stars is essential to investigate and constrain the impact of stellar mass on planet properties. However, such targets are still poorly explored in radial velocity (RV) surveys because they only feature a small number of stellar lines and those are usually broadened and blended by stellar rotation as well as stellar jitter. As a result, the available information about the formation and evolution of planets and brown dwarfs around hot stars is limited.

Aims. We aim to increase the sample and precisely measure the masses and eccentricities of giant planets and brown dwarfs transiting early-type stars detected by the Transiting Exoplanet Survey Satellite (TESS).

Methods. We followed bright (V < 12 mag) stars with T-eff > 6200 K that host giant companions (R > 7R(circle plus)) using ground-based photometric observations as well as high precision radial velocity measurements from the CORALIE, CHIRON, TRES, FEROS, and MINERVA-Australis spectrographs.

Results. In the context of the search for exoplanets and brown dwarfs around early-type stars, we present the discovery of three brown dwarf companions, TOI-629b, TOI-1982b, and TOI-2543b, and one massive planet, TOI-1107b. From the joint analysis of TESS and ground-based photometry in combination with high precision radial velocity measurements, we find the brown dwarfs have masses between 66 and 68 M-Jup, periods between 7.54 and 17.17 days, and radii between 0.95 and 1.11 R-Jup. The hot Jupiter TOI-1107b has an orbital period of 4.08 days, a radius of 1.30 R-Jup, and a mass of 3.35 M-Jup. As a by-product of this program, we identified four low-mass eclipsing components (TOI-288b, TOI-446b, TOI-478b, and TOI-764b).

Conclusions. Both TOI-1107b and TOI-1982b present an anomalously inflated radius with respect to the age of these systems. TOI-629 is among the hottest stars with a known transiting brown dwarf. TOI-629b and T01-1982b are among the most eccentric brown dwarfs. The massive planet and the three brown dwarfs add to the growing population of well-characterized giant planets and brown dwarfs transiting AF-type stars and they reduce the apparent paucity.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0004-6361 ISBN Medium
Area Expedition Conference
Notes WOS:000840123200001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1640
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Author Saunders, N.; Grunblatt, S.K.; Huber, D.; Collins, K.A.; Jensen, E.L.N.; Vanderburg, A.; Brahm, R.; Jordan, A.; Espinoza, N.; Henning, T.; Hobson, M.J.; Quinn, S.N.; Zhou, G.; Butler, R.P.; Crause, L.; Kuhn, R.B.; Mogotsi, K.M.; Hellier, C.; Angus, R.; Hattori, S.; Chontos, A.; Ricker, G.R.; Jenkins, J.M.; Tenenbaum, P.; Latham, D.W.; Seager, S.; Vanderspek, R.K.; Winn, J.N.; Stockdale, C.; Cloutier, R.
Title TESS Giants Transiting Giants. I.: A Noninflated Hot Jupiter Orbiting a Massive Subgiant Type
Year 2022 Publication Astronomical Journal Abbreviated Journal Astron. J.
Volume 163 Issue 2 Pages 53
Keywords SATURN; PLANET; EVOLUTION; EFFICIENT
Abstract While the population of confirmed exoplanets continues to grow, the sample of confirmed transiting planets around evolved stars is still limited. We present the discovery and confirmation of a hot Jupiter orbiting TOI-2184 (TIC 176956893), a massive evolved subgiant (M-* = 1.53 +/- 0.12 M-circle dot, R-* = 2.90 +/- 0.14 R-circle dot) in the Transiting Exoplanet Survey Satellite (TESS) Southern Continuous Viewing Zone. The planet was flagged as a false positive by the TESS Quick-Look Pipeline due to periodic systematics introducing a spurious depth difference between even and odd transits. Using a new pipeline to remove background scattered light in TESS Full Frame Image data, we combine space-based TESS photometry, ground-based photometry, and ground-based radial velocity measurements to report a planet radius of R (p) = 1.017 +/- 0.051 R (J) and mass of M (p) = 0.65 +/- 0.16 M (J) . For a planet so close to its star, the mass and radius of TOI-2184b are unusually well matched to those of Jupiter. We find that the radius of TOI-2184b is smaller than theoretically predicted based on its mass and incident flux, providing a valuable new constraint on the timescale of post-main-sequence planet inflation. The discovery of TOI-2184b demonstrates the feasibility of detecting planets around faint (TESS magnitude > 12) post-main-sequence stars and suggests that many more similar systems are waiting to be detected in the TESS FFIs, whose confirmation may elucidate the final stages of planetary system evolution.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0004-6256 ISBN Medium
Area Expedition Conference
Notes WOS:000740832800001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1534
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