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Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778

Authors :
Clark, Jake
Addison, Brett
Okumura, Jack
Vach, Sydney
Heitzmann, Alexis
Rodriguez, Joseph
Wright, Duncan
Clerte, Mathieu
Brown, Carolyn
Fetherolf, Tara
Wittenmyer, Robert
Plavchan, Peter
Kane, Stephen
Horner, Jonathan
Kielkopf, John
Shporer, Avi
Tinney, C.
Hui-Gen, Liu
Ballard, Sarah
Bowler, Brendan
Mengel, Matthew
Zhou, George
Lee, Annette
David, Avelyn
Heim, Jessica
Lee, Michele
Sevilla, Veronica
Zafar, Naqsh
Hinkel, Natalie
Allen, Bridgette
Bayliss, Daniel
Berberyan, Arthur
Berlind, Perry
Bieryla, Allyson
Bouchy, Francois
Brahm, Rafael
Bryant, Edward
Christiansen, Jessie
Ciardi, David
Ciardi, Krys
Collins, Karen
Dallant, Jules
Davis, Allen
Diaz, Matias
Dressing, Courtney
Esquerdo, Gilbert
Harre, Jan-Vincent
Howell, Steve
Jenkins, Jon
Jensen, Eric
Jones, Matias
Jordan, Andres
Latham, David
Lund, Michael
McCormac, James
Nielsen, Louise
Otegi, Jon
Quinn, Samuel
Radford, Don
Ricker, George
Schwarz, Richard
Seager, Sara
Smith, Alexis
Stockdale, Chris
Tan, Thiam-Guan
Udry, Stephane
Vanderspek, Roland
Gunther, Maximilian
Wang, Songhu
Wingham, Geof
Winn, Joshua
Source :
AJ 165 207 (2023)
Publication Year :
2022

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 ($v\sin{(i)}= 35.1\pm1.0$km/s) early F3V-dwarf, HD115447 (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 characterise TOI-778b. A joint analysis of the light curves and the radial velocity measurements yield a mass, radius, and orbital period for TOI-778b of $2.76^{+0.24}_{-0.23}$Mjup, $1.370\pm0.043$Rjup and $\sim4.63$ days, respectively. The planet orbits a bright ($V = 9.1$mag) F3-dwarf with $M=1.40\pm0.05$Msun, $R=1.70\pm0.05$Rsun, and $\log g=4.05\pm0.17$. We observed a spectroscopic transit of TOI-778b, which allowed us to derive a sky-projected spin-orbit angle of $18^{\circ}\pm11^{\circ}$, 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.<br />Comment: 18 pages, 9 figures, and 4 tables. Submitted to the Astronomical Journal

Details

Database :
arXiv
Journal :
AJ 165 207 (2023)
Publication Type :
Report
Accession number :
edsarx.2212.08242
Document Type :
Working Paper
Full Text :
https://doi.org/10.3847/1538-3881/acc3a0