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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. |
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Title |
TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS |
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2023 |
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Astronomical Journal |
Abbreviated Journal |
Astron. J. |
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165 |
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4 |
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179 |
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Keywords |
HOT JUPITERS; EXOPLANET SURVEY; SUPER-EARTH; LOW-DENSITY; SYSTEMS; NEPTUNE; STAR; II.; POPULATION; MIGRATION |
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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 @ |
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1835 |
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