Spinning up a Daze: TESS Uncovers a Hot Jupiter Orbiting the Rapid Rotator TOI-778
Author:
Clark Jake T.ORCID, Addison Brett C.ORCID, Okumura JackORCID, Vach SydneyORCID, Errico AdrianaORCID, Heitzmann AlexisORCID, Rodriguez Joseph E.ORCID, Wright Duncan J.ORCID, Clerté MathieuORCID, Brown Carolyn J.ORCID, Fetherolf TaraORCID, Wittenmyer Robert A.ORCID, Plavchan PeterORCID, Kane Stephen R.ORCID, Horner JonathanORCID, Kielkopf John F.ORCID, Shporer AviORCID, Tinney C. G.ORCID, Hui-Gen LiuORCID, Ballard SarahORCID, Bowler Brendan P.ORCID, Mengel Matthew W.ORCID, Zhou GeorgeORCID, Lee Annette S., David AvelynORCID, Heim Jessica, Lee Michele E., Sevilla Verónica, Zafar Naqsh E., Hinkel Natalie R.ORCID, Allen Bridgette E., Bayliss DanielORCID, Berberyan Arthur, Berlind Perry, Bieryla AllysonORCID, Bouchy FrançoisORCID, Brahm RafaelORCID, Bryant Edward M.ORCID, Christiansen Jessie L.ORCID, Ciardi David R.ORCID, Ciardi Krys N., Collins Karen A.ORCID, Dallant JulesORCID, Davis Allen B.ORCID, Díaz Matías R.ORCID, Dressing Courtney D.ORCID, Esquerdo Gilbert A.ORCID, Harre Jan-VincentORCID, Howell Steve B.ORCID, Jenkins Jon M.ORCID, Jensen Eric L. N.ORCID, Jones Matías I., Jordán AndrésORCID, Latham David W.ORCID, Lund Michael B.ORCID, McCormac JamesORCID, Nielsen Louise D.ORCID, Otegi Jon, Quinn Samuel N.ORCID, Radford Don J.ORCID, Ricker George R.ORCID, Schwarz Richard P.ORCID, Seager SaraORCID, Smith Alexis M. S.ORCID, Stockdale ChrisORCID, Tan Thiam-GuanORCID, Udry StéphaneORCID, Vanderspek RolandORCID, Günther Maximilian N.ORCID, Wang SonghuORCID, Wingham Geof, Winn Joshua N.ORCID
Abstract
Abstract
NASA’s Transiting Exoplanet Survey Satellite (TESS) mission has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facilitating the confirmation and mass determination of these worlds. We present the discovery of a hot Jupiter orbiting a rapidly rotating (
v
sin
(
i
)
=
35.1
±
1.0
km s−1) early F3V-dwarf, HD 115447 (TOI-778). The transit signal taken from Sectors 10 and 37 of TESS's initial detection of the exoplanet is combined with follow-up ground-based photometry and velocity measurements taken from Minerva-Australis, TRES, CORALIE, and CHIRON to confirm and characterize TOI-778 b. A joint analysis of the light curves and the radial velocity measurements yields a mass, a radius, and an orbital period for TOI-778 b of
2.76
−
0.23
+
0.24
M
J, 1.370 ± 0.043 R
J, and ∼4.63 days, respectively. The planet orbits a bright (V = 9.1 mag) F3-dwarf with M = 1.40 ± 0.05 M
⊙, R = 1.70 ± 0.05 R
⊙, and
log
g
=
4.05
±
0.17
. We observed a spectroscopic transit of TOI-778 b, which allowed us to derive a sky-projected spin–orbit angle of 18° ± 11°, consistent with an aligned planetary system. This discovery demonstrates the capability of smaller-aperture telescopes such as Minerva-Australis to detect the radial velocity signals produced by planets orbiting broad-line, rapidly rotating stars.
Funder
Department of Education and Training ∣ Australian Research Council
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
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