TY - JOUR
T1 - TOI-2374 b and TOI-3071 b
T2 - Two metal-rich sub-Saturns well within the Neptunian desert
AU - Hacker, Alejandro
AU - Díaz, Rodrigo F.
AU - Armstrong, David J.
AU - Fernández Fernández, Jorge
AU - Müller, Simon
AU - Delgado-Mena, Elisa
AU - Sousa, Sergio G.
AU - Adibekyan, Vardan
AU - Stassun, Keivan G.
AU - Collins, Karen A.
AU - Yee, Samuel W.
AU - Bayliss, Daniel
AU - Bieryla, Allyson
AU - Bouchy, François
AU - Paul Butler, R.
AU - Crane, Jeffrey D.
AU - Dumusque, Xavier
AU - Hartman, Joel D.
AU - Helled, Ravit
AU - Jenkins, Jon
AU - Keniger, Marcelo Aron F.
AU - Lewis, Hannah
AU - Lillo-Box, Jorge
AU - Lund, Michael B.
AU - Nielsen, Louise D.
AU - Osborn, Ares
AU - Osip, David
AU - Paegert, Martin
AU - Radford, Don J.
AU - Santos, Nuno C.
AU - Seager, Sara
AU - Shectman, Stephen A.
AU - Srdoc, Gregor
AU - Strøm, Paul A.
AU - Tan, Thiam Guan
AU - Teske, Johanna K.
AU - Vezie, Michael
AU - Watanabe, David
AU - Watkins, Cristilyn N.
AU - Wheatley, Peter J.
AU - Winn, Joshua N.
AU - Wohler, Bill
AU - Ziegler, Carl
N1 - Publisher Copyright:
© 2024 The Author(s).
PY - 2024/8/1
Y1 - 2024/8/1
N2 - We report the discovery of two transiting planets detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V and an F8V star, respectively, with periods of 4.31 and 1.27 d, respectively. We confirm and characterize these two planets with a variety of ground-based and follow-up observations, including photometry, precise radial velocity monitoring and high-resolution imaging. The planetary and orbital parameters were derived from a joint analysis of the radial velocities and photometric data. We found that the two planets have masses of (57 ± 4) M⊕ or (0.18 ± 0.01) MJ, and (68 ± 4) M⊕ or (0.21 ± 0.01) MJ, respectively, and they have radii of (6.8 ± 0.3) R⊕ or (0.61 ± 0.03) RJ and (7.2 ± 0.5) R⊕ or (0.64 ± 0.05) RJ, respectively. These parameters correspond to sub-Saturns within the Neptunian desert, both planets being hot and highly irradiated, with Teq ≈ 745 K and Teq ≈ 1812 K, respectively, assuming a Bond albedo of 0.5. TOI-3071 b has the hottest equilibrium temperature of all known planets with masses between 10 and 300 M⊕ and radii less than 1.5 RJ. By applying gas giant evolution models we found that both planets, especially TOI-3071 b, are very metal-rich. This challenges standard formation models which generally predict lower heavy-element masses for planets with similar characteristics. We studied the evolution of the planets' atmospheres under photoevaporation and concluded that both are stable against evaporation due to their large masses and likely high metallicities in their gaseous envelopes.
AB - We report the discovery of two transiting planets detected by the Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V and an F8V star, respectively, with periods of 4.31 and 1.27 d, respectively. We confirm and characterize these two planets with a variety of ground-based and follow-up observations, including photometry, precise radial velocity monitoring and high-resolution imaging. The planetary and orbital parameters were derived from a joint analysis of the radial velocities and photometric data. We found that the two planets have masses of (57 ± 4) M⊕ or (0.18 ± 0.01) MJ, and (68 ± 4) M⊕ or (0.21 ± 0.01) MJ, respectively, and they have radii of (6.8 ± 0.3) R⊕ or (0.61 ± 0.03) RJ and (7.2 ± 0.5) R⊕ or (0.64 ± 0.05) RJ, respectively. These parameters correspond to sub-Saturns within the Neptunian desert, both planets being hot and highly irradiated, with Teq ≈ 745 K and Teq ≈ 1812 K, respectively, assuming a Bond albedo of 0.5. TOI-3071 b has the hottest equilibrium temperature of all known planets with masses between 10 and 300 M⊕ and radii less than 1.5 RJ. By applying gas giant evolution models we found that both planets, especially TOI-3071 b, are very metal-rich. This challenges standard formation models which generally predict lower heavy-element masses for planets with similar characteristics. We studied the evolution of the planets' atmospheres under photoevaporation and concluded that both are stable against evaporation due to their large masses and likely high metallicities in their gaseous envelopes.
KW - exoplanets
KW - planetary systems
KW - planets and satellites: detection
KW - planets and satellites: gaseous planets
KW - planets and satellites: individual: (TOI-2374, TIC 439366538, and TOI-3071, TIC 452006073)
UR - http://www.scopus.com/inward/record.url?scp=85198277847&partnerID=8YFLogxK
U2 - 10.1093/mnras/stae1420
DO - 10.1093/mnras/stae1420
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:85198277847
SN - 0035-8711
VL - 532
SP - 1612
EP - 1634
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -