TOI 560: Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS, and HIRES RVs
Author:
El Mufti MohammedORCID, Plavchan Peter P.ORCID, Isaacson HowardORCID, Cale Bryson L.ORCID, Feliz Dax L.ORCID, Reefe Michael A.ORCID, Hellier CoelORCID, Stassun KeivanORCID, Eastman JasonORCID, Polanski Alex, Crossfield Ian J. M., Gaidos EricORCID, Kostov VeselinORCID, Wittrock Justin M.ORCID, Villaseñor Joel, Schlieder Joshua E.ORCID, Bouma Luke G.ORCID, Collins Kevin I.ORCID, Zohrabi FarzanehORCID, Lee Rena A.ORCID, Sohani Ahmad, Berberian John, Vermilion DavidORCID, Newman PatrickORCID, Geneser ClaireORCID, Tanner Angelle, Batalha Natalie M.ORCID, Dressing CourtneyORCID, Fulton BenjaminORCID, Howard Andrew W.ORCID, Huber DanielORCID, Kane Stephen R.ORCID, Petigura Erik A.ORCID, Robertson PaulORCID, Roy ArpitaORCID, Weiss Lauren M.ORCID, Behmard AidaORCID, Beard CoreyORCID, Chontos AshleyORCID, Dai FeiORCID, Dalba Paul A.ORCID, Fetherolf TaraORCID, Giacalone StevenORCID, Hill Michelle L., Hirsch Lea A.ORCID, Holcomb RaeORCID, Lubin JackORCID, Mayo AndrewORCID, Močnik TeoORCID, Akana Murphy Joseph M.ORCID, Rosenthal Lee J.ORCID, Rubenzahl Ryan A.ORCID, Scarsdale NicholasORCID, Stockdale ChristopherORCID, Collins KarenORCID, Cloutier RyanORCID, Relles Howard, Tan Thiam-GuanORCID, Scott Nicholas JORCID, Hartman ZachORCID, Matthews ElisabethORCID, Ciardi David R.ORCID, Gonzales Erica, Matson Rachel A.ORCID, Beichman Charles, Bieryla AllysonORCID, Furlan E.ORCID, Gnilka Crystal L.ORCID, Howell Steve B.ORCID, Ziegler Carl, Briceño CésarORCID, Law NicholasORCID, Mann Andrew W.ORCID, Rabus MarkusORCID, Johnson Marshall C.ORCID, Christiansen Jessie, Kreidberg LauraORCID, Berardo David AnthonyORCID, Deming Drake, Gorjian VaroujanORCID, Morales Farisa Y.ORCID, Benneke BjörnORCID, Dragomir DianaORCID, Wittenmyer Robert A.ORCID, Ballard Sarah, Bowler Brendan P.ORCID, Horner JonathanORCID, Kielkopf JohnORCID, Liu HuigenORCID, Shporer AviORCID, Tinney C. G.ORCID, Zhang HuiORCID, Wright Duncan J.ORCID, Addison Brett C.ORCID, Mengel Matthew W., Okumura Jack
Abstract
Abstract
We validate the presence of a two-planet system orbiting the 0.15–1.4 Gyr K4 dwarf TOI 560 (HD 73583). The system consists of an inner moderately eccentric transiting mini-Neptune (TOI 560 b,
P
=
6.3980661
−
0.0000097
+
0.0000095
days,
e
=
0.294
−
0.062
+
0.13
,
M
=
0.94
−
0.23
+
0.31
M
Nep
) initially discovered in the Sector 8 Transiting Exoplanet Survey Satellite (TESS) mission observations, and a transiting mini-Neptune (TOI 560 c,
P
=
18.8805
−
0.0011
+
0.0024
days,
M
=
1.32
−
0.32
+
0.29
M
Nep
) discovered in the Sector 34 observations, in a rare near-1:3 orbital resonance. We utilize photometric data from TESS Spitzer, and ground-based follow-up observations to confirm the ephemerides and period of the transiting planets, vet false-positive scenarios, and detect the photoeccentric effect for TOI 560 b. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with the iSHELL spectrograph at the NASA Infrared Telescope Facility and the HIRES Spectrograph at Keck Observatory to validate the planetary nature of these signals, which we combine with published Planet Finder Spectrograph RVs from the Magellan Observatory. We detect the masses of both planets at >3σ significance. We apply a Gaussian process (GP) model to the TESS light curves to place priors on a chromatic RV GP model to constrain the stellar activity of the TOI 560 host star, and confirm a strong wavelength dependence for the stellar activity demonstrating the ability of near-IR RVs to mitigate stellar activity for young K dwarfs. TOI 560 is a nearby moderately young multiplanet system with two planets suitable for atmospheric characterization with the James Webb Space Telescope and other upcoming missions. In particular, it will undergo six transit pairs separated by <6 hr before 2027 June.
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
4 articles.
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