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Jones, M.I.; Reinarz, Y.; Brahm, R .; Tala Pinto, M.; Eberhardt, J.; Rojas, F.; Triaud, A.H.M.J.; Gupta, A.F.; Ziegler, C.; Hobson, M.J.; Jordan, A.; Henning, T.; Trifonov, T.; Schlecker, M.; Espinoza, N.; Torres-Miranda, P.; Sarkis, P.; Ulmer-Moll, S.; Lendl, M.; Uzundag, M.; Moyano, M.; Hesse, K.; Caldwell, D.A.; Shporer, A.; Lund, M.B.; Jenkins, J.M.; Seager, S.; Winn, J.N.; Ricker, G.R.; Burke, C.J.; Figueira, P.; Psaridi, A.; Al Moulla, K.; Mounzer, D.; Standing, M.R.; Martin, D.V.; Dransfield, G.; Baycroft, T.; Dragomir, D.; Boyle, G.; Suc, V.; Mann, A.W.; Timmermans, M.; Ducrot, E.; Hooton, M.J.; Zuniga-Fernandez, S.; Sebastian, D.; Gillon, M.; Queloz, D.; Carson, J.; Lissauer, J.J. |
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A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS |
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2024 |
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Astronomy & Astrophysics |
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Astron. Astrophys. |
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683 |
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A192 |
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techniques: photometric; techniques: radial velocities; planets and satellites: composition; planets and satellites: detection; planets and satellites: formation; planets and satellites: gaseous planets |
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We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space mission. Ground-based photometric and spectroscopic follow-up from different facilities, confirmed the substellar nature of TIC 4672985 b, a massive gas giant in the transition between the super-Jupiters and brown dwarfs mass regime. From the joint analysis we derived the following orbital parameters: P = 69.0480(-0.0005)(+0.0004) d, M-p = 12.74(-1.01)(+1.01) M-J, R-p = 1.026(-0.067)(+0.065) R-J and e = 0.018(-0.004)(+0.004). In addition, the RV time series revealed a significant trend at the similar to 350 m s(-1) yr(-1) level, which is indicative of the presence of a massive outer companion in the system. TIC 4672985 b is a unique example of a transiting substellar companion with a mass above the deuterium-burning limit, located beyond 0.1 AU and in a nearly circular orbit. These planetary properties are difficult to reproduce from canonical planet formation and evolution models. For TOI-2529 b, we obtained the following orbital parameters: P = 64.5949(-0.0003)(+0.0003) d, M-p = 2.340(-0.195)(+0.197) M-J, R-p = 1.030(-0.050)(+0.050) R-J and e = 0.021(-0.015)(+0.024), making this object a new example of a growing population of transiting warm giant planets. |
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0004-6361 |
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WOS:001188136600004 |
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UAI @ alexi.delcanto @ |
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1978 |
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Kaye, L.; Vissapragada, S.; Gunther, M.N.; Aigrain, S.; Mikal-Evans, T.; Jensen, E.L.N.; Parviainen, H.; Pozuelos, F.J.; Abe, L.; Acton, J.S.; Agabi, A.; Alves, D.R.; Anderson, D.R.; Armstrong, D.J.; Barkaoui, K.; Barragan, O.; Benneke, B.; Boyd, P.T.; Brahm, R.; Bruni, I.; Bryant, E.M.; Burleigh, M.R.; Casewell, S.L.; Ciardi, D.; Cloutier, R.; Collins, K.A.; Collins, K.I.; Conti, D.M.; Crossfield, I.J.M.; Crouzet, N.; Daylan, T.; Dragomir, D.; Dransfield, G.; Fabrycky, D.; Fausnaugh, M.; Gan, T.J.; Gill, S.; Gillon, M.; Goad, M.R.; Gorjian, V.; Greklek-McKeon, M.; Guerrero, N.; Guillot, T.; Jehin, E.; Jenkins, J.S.; Lendl, M.; Kamler, J.; Kane, S.R.; Kielkopf, J.F.; Kunimoto, M.; Marie-Sainte, W.; McCormac, J.; Mekarnia, D.; Morales, F.Y.; Moyano, M.; Palle, E.; Parmentier, V; Relles, H.M.; Schmider, F.X.; Schwarz, R.P.; Seager, S.; Smith, A.M.S.; Tan, T.G.; Taylor, J.; Triaud, A.H.M.J.; Twicken, J.D.; Udry, S.; Vines, J.I.; Wang, G.; Wheatley, P.J.; Winn, J.N. |
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Transit timings variations in the three-planet system: TOI-270 |
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2022 |
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Monthly Notices Of The Royal Astronomical Society |
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Mon. Not. Roy. Astron. Soc. |
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510 |
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4 |
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5464-5485 |
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planets and satellites: composition; planets and satellites: formation; planets and satellites: fundamental parameters |
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We present ground- and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth and two sub-Neptunes discovered by TESS around a bright (K-mag = 8.25) M3V dwarf. The planets orbit near low-order mean-motion resonances (5:3 and 2:1) and are thus expected to exhibit large transit timing variations (TTVs). Following an extensive observing campaign using eight different observatories between 2018 and 2020, we now report a clear detection of TTVs for planets c and d, with amplitudes of similar to 10 min and a super-period of similar to 3 yr, as well as significantly refined estimates of the radii and mean orbital periods of all three planets. Dynamical modelling of the TTVs alone puts strong constraints on the mass ratio of planets c and d and on their eccentricities. When incorporating recently published constraints from radial velocity observations, we obtain masses of M-b = 1.48 +/- 0.18 M-circle plus, M-c = 6.20 +/- 0.31 M-circle plus, and M-d = 4.20 +/- 0.16 M-circle plus for planets b, c, and d, respectively. We also detect small but significant eccentricities for all three planets : e(b) = 0.0167 +/- 0.0084, e(c) = 0.0044 +/- 0.0006, and e(d) = 0.0066 +/- 0.0020. Our findings imply an Earth-like rocky composition for the inner planet, and Earth-like cores with an additional He/H2O atmosphere for the outer two. TOI-270 is now one of the best constrained systems of small transiting planets, and it remains an excellent target for atmospheric characterization. |
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0035-8711 |
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WOS:000764893900001 |
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UAI @ alexi.delcanto @ |
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1552 |
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