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| Author |
Heitzmann, A.; Zhou, G.; Quinn, S.N.; Huang, C.X.; Dong, J.Y.; Bouma, L.G.; Dawson, R.I.; Marsden, S.C.; Wright, D.; Petit, P.; Collins, K.A.; Barkaoui, K.; Wittenmyer, R.A.; Gillen, E.; Brahm, R.; Hobson, M.; Hellier, C.; Ziegler, C.; Briceno, C.; Law, N.; Mann, A.W.; Howell, S.B.; Gnilka, C.L.; Littlefield, C.; Latham, D.W.; Lissauer, J.J.; Newton, E.R.; Krolikowski, D.M.; Kerr, R.; Rampalli, R.; Douglas, S.T.; Eisner, N.L.; Guedj, N.; Sun, G.Y.; Smit, M.; Huten, M.; Eschweiler, T.; Abe, L.; Guillot, T.; Ricker, G.; Vanderspek, R.; Seager, S.; Jenkins, J.M.; Ting, E.B.; Winn, J.N.; Ciardi, D.R.; Vanderburg, A.M.; Burke, C.J.; Rodriguez, D.R.; Daylan, T. |
| Title |
TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star |
Type |
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| Year |
2023 |
Publication |
Astronomical Journal |
Abbreviated Journal |
Astron. J. |
| Volume |
165 |
Issue |
3 |
Pages |
121 |
| Keywords |
K2 ROTATION PERIOD; SOLD TRANSITING HOT; LOW-MASS HYADS; TESS HUNT; GIANT PLANETS; STELLAR SPECTRA; WARM JUPITERS; LIGHT CURVES; SIZED PLANET; SURVEY. II. |
| Abstract |
We report the discovery of TOI-4562b (TIC-349576261), a Jovian planet orbiting a young F7V-type star, younger than the Praesepe/Hyades clusters (< 700 Myr). This planet stands out because of its unusually long orbital period for transiting planets with known masses (Porb = 225.11781(- 0.00022) (+0.00025 )days) and because it has a substantial eccentricity (e = 0.76(- 0.02) (+0.02)). The location of TOI-4562 near the southern continuous viewing zone of TESS allowed observations throughout 25 sectors, enabling an unambiguous period measurement from TESS alone. Alongside the four available TESS transits, we performed follow-up photometry using the South African Astronomical Observatory node of the Las Cumbres Observatory and spectroscopy with the CHIRON spectrograph on the 1.5 m SMARTS telescope. We measure a radius of 1.118 (+0.013) (-0.014) R(J )and a mass of 2.30(-0.47)(+0.48)M(J) for TOI-4562b. The radius of the planet is consistent with contraction models describing the early evolution of the size of giant planets. We detect tentative transit timing variations at the similar to 20 minutes level from five transit events, favoring the presence of a companion that could explain the dynamical history of this system if confirmed by future follow-up observations. With its current orbital configuration, tidal timescales are too long for TOI-4562b to become a hot Jupiter via high eccentricity migration though it is not excluded that interactions with the possible companion could modify TOI4562b's eccentricity and trigger circularization. The characterization of more such young systems is essential to set constraints on models describing giant-planet evolution. |
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0004-6256 |
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WOS:000940570300001 |
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UAI @ alexi.delcanto @ |
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1759 |
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Trifonov, T.; Brahm, R.; Jordan, A.; Hartogh, C.; Henning, T.; Hobson, M.J.; Schlecker, M.; Howard, S.; Reichardt, F.; Espinoza, N.; Lee, M.H.; Nesvorny, D.; Rojas, F.I.; Barkaoui, K.; Kossakowski, D.; Boyle, G.; Dreizler, S.; Kurster, M.; Heller, R.; Guillot, T.; Triaud, A.H.M.J.; Abe, L.; Agabi, A.; Bendjoya, P.; Crouzet, N.; Dransfield, G.; Gasparetto, T.; Gunther, M.N.; Marie-Sainte, W.; Mekarnia, D.; Suarez, O.; Teske, J.; Butler, R.P.; Crane, J.D.; Shectman, S.; Ricker, G.R.; Shporer, A.; Vanderspek, R.; Jenkins, J.M.; Wohler, B.; Collins, K.A.; Collins, K.I.; Ciardi, D.R.; Barclay, T.; Mireles, I.; Seager, S.; Winn, J.N. |
| Title |
TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS |
Type |
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| Year |
2023 |
Publication |
Astronomical Journal |
Abbreviated Journal |
Astron. J. |
| Volume |
165 |
Issue |
4 |
Pages |
179 |
| Keywords |
HOT JUPITERS; EXOPLANET SURVEY; SUPER-EARTH; LOW-DENSITY; SYSTEMS; NEPTUNE; STAR; II.; POPULATION; MIGRATION |
| Abstract |
The K-type star TOI-2525 has an estimated mass of M = 0.849(-0.033)(+0.024) M-circle dot and radius of R = 0.785(-0.007)(+0.007) R-circle dot observed by the TESS mission in 22 sectors (within sectors 1 and 39). The TESS light curves yield significant transit events of two companions, which show strong transit timing variations (TTVs) with a semiamplitude of similar to 6 hr. We performed TTV dynamical and photodynamical light-curve analysis of the TESS data combined with radial velocity measurements from FEROS and PFS, and we confirmed the planetary nature of these companions. The TOI-2525 system consists of a transiting pair of planets comparable to Neptune and Jupiter with estimated dynamical masses of m(b) = 0.088(-0.004)(+0.005) and m(c) = 0.709(-0.033)(+0.034) M-Jup, radii of r(b) = 0.88(-0.02)(+0.02) and r(c) = 0.98(-0.02)(+0.02) R-Jup, and orbital periods of P-b = 23.288(-0.002)(+0.001) and P-c = 49.260(-0.001)(+0.001) days for the inner and outer planet, respectively. The period ratio is close to the 2:1 period commensurability, but the dynamical simulations of the system suggest that it is outside the mean-motion resonance (MMR) dynamical configuration. Object TOI-2525 b is among the lowest-density Neptune-mass planets known to date, with an estimated median density of rho(b) = 0.174(-0.015)(+0.016) g cm(-3). The TOI-2525 system is very similar to the other K dwarf systems discovered by TESS, TOI-2202 and TOI-216, which are composed of almost identical K dwarf primaries and two warm giant planets near the 2:1 MMR. |
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0004-6256 |
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WOS:000960020200001 |
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UAI @ alexi.delcanto @ |
Serial |
1835 |
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