Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994*
Author:
Rodríguez Martínez RomyORCID, Eastman Jason D.ORCID, Collins Karen A.ORCID, Rodriguez Joseph E.ORCID, Charbonneau DavidORCID, Quinn Samuel N.ORCID, Latham David W.ORCID, Ziegler CarlORCID, Brahm RafaelORCID, Fairnington Tyler R.ORCID, Ulmer-Moll SolÉneORCID, Stassun Keivan G.ORCID, Suarez OlgaORCID, Guillot TristanORCID, Hobson Melissa J.ORCID, Winn Joshua N.ORCID, Kanodia ShubhamORCID, Schlecker MartinORCID, Butler R. P.ORCID, Crane Jeffrey D.ORCID, Shectman SteveORCID, Teske Johanna K.ORCID, Osip DavidORCID, Beletsky Yuri, Battley Matthew P.ORCID, Psaridi AngelicaORCID, Figueira PedroORCID, Lendl MonikaORCID, Bouchy François, Udry Stéphane, Kunimoto MichelleORCID, Mékarnia Djamel, Abe Lyu, Trifonov TrifonORCID, Tala Pinto Marcelo, Eberhardt JanORCID, Espinoza NestorORCID, Henning ThomasORCID, Jordán AndrésORCID, Rojas Felipe I.ORCID, Barkaoui KhalidORCID, Relles Howard M.ORCID, Srdoc Gregor, Collins Kevin I.ORCID, Seager SaraORCID, Shporer AviORCID, Vezie Michael, Hedges Christina, Mireles IsmaelORCID
Abstract
Abstract
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite. TOI-4994b transits a G-type star (V = 12.6 mag) with a mass, radius, and effective temperature of
M
⋆
=
1.00
5
−
0.061
+
0.064
M
⊙
,
R
⋆
=
1.05
5
−
0.037
+
0.040
R
⊙
, and T
eff = 5640 ± 110 K. We obtained follow-up ground-based photometry from the Las Cumbres Observatory and the Antarctic Search for Transiting ExoPlanets telescopes, and we confirmed the planetary nature of TOI-4994b with multiple radial velocity observations from the Planet Finder Spectrograph, CHIRON, High Accuracy Radial velocity Planet Searcher, Fiber-fed Extended Range Optical Spectrograph, and CORALIE instruments. From a global fit to the photometry and radial velocities, we determine that TOI-4994b is in a 21.5 day eccentric orbit (e = 0.32 ± 0.04) and has a mass of
M
P
=
0.28
0
−
0.034
+
0.037
M
J
, a radius of
R
P
=
0.76
2
−
0.027
+
0.030
R
J
, and a Saturn-like bulk density of
ρ
p
=
0.7
8
−
0.14
+
0.16
g
cm
-
3
. We find that TOI-4994 is a potentially viable candidate for follow-up stellar obliquity measurements. TOI-4994b joins the small sample of warm Saturn analogs and thus sheds light on our understanding of these rare and unique worlds.
Publisher
American Astronomical Society
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