J/AJ/168/101 High resolution spectroscopic obs. of TOI-6255 (Dai+, 2024)
An Earth-sized planet on the verge of tidal disruption.
Dai F., Howard A.W., Halverson S., Orell-Miquel J., Palle E., Isaacson H.,
Fulton B., Price E.M., Plotnykov M., Rogers L.A., Valencia D., Paragas K.,
Greklek-McKeon M., Gomez Barrientos J., Knutson H.A., Petigura E.A.,
Weiss L.M., Lee R., Brinkman C.L., Huber D., Stefansson G., Masuda K.,
Giacalone S., Lu C.X., Kite E.S., Hu R., Gaidos E., Zhang M.,
Rubenzahl R.A., Winn J.N., Han Te, Beard C., Holcomb R., Householder A.,
Gilbert G.J., Lubin J., Ong J.M.J., Polanski A.S., Saunders N.,
Van Zandt J., Yee S.W., Zhang J., Zink J., Holden B., Baker A.,
Brodheim M., Crossfield I.J.M., Deich W., Edelstein J., Gibson S.R.,
Hill G.M., Jelinsky S.R., Kassis M., Laher R.R., Lanclos K., Lilley S.,
Payne J.N., Rider K., Robertson P., Roy A., Schwab C., Shaum A.P.,
Sirk M.M., Smith C., Vandenberg A., Walawender J., Wang S.X.,
Wang S.-Y.(., Wishnow E., Wright J.T., Yeh S., Caballero J.A.,
Morales J.C., Murgas F., Nagel E., Reiners A., Schweitzer A.,
Tabernero H.M., Zechmeister M., Spencer A., Ciardi D.R., Clark C.A.,
Lund M.B., Caldwell D.A., Collins K.A., Schwarz R.P., Barkaoui K.,
Watkins C., Shporer A., Narita N., Fukui A., Srdoc G., Latham D.W.,
Jenkins J.M., Ricker G.R., Seager S., Vanderspek R.
<Astron. J., 168, 101 (2024)>
=2024AJ....168..101D 2024AJ....168..101D
ADC_Keywords: Exoplanets; Stars, M-type; Spectra, optical; Spectra, infrared;
Radial velocities
Keywords: Exoplanet formation ; Exoplanet evolution ; Star-planet interactions
Abstract:
TOI-6255 b (GJ 4256) is an Earth-sized planet
(1.079±0.065R⊕) with an orbital period of only 5.7hr. With
the newly commissioned Keck Planet Finder and CARMENES spectrographs,
we determine the planet's mass to be 1.44±0.14M⊕. The planet
is just outside the Roche limit, with Porb/PRoche=1.13±0.10. The
strong tidal force likely deforms the planet into a triaxial ellipsoid
with a long axis that is ∼10% longer than the short axis. Assuming a
reduced stellar tidal quality factor Q*'∼107, we predict that
tidal orbital decay will cause TOI-6255 to reach the Roche limit in
roughly 400Myr. Such tidal disruptions may produce the possible
signatures of planet engulfment that have been seen on stars with
anomalously high refractory elemental abundances compared to their
conatal binary companions. TOI-6255 b is also a favorable target for
searching for star-planet magnetic interactions, which might cause
interior melting and hasten orbital decay. TOI-6255 b is a top target
(with an Emission Spectroscopy Metric of about 24) for phase-curve
observations with the James Webb Space Telescope.
Description:
TESS observed TOI-6255 during Sectors 16 and 56 in 2019 September and
in 2022 September. We downloaded the 2 minutes cadence light curve
produced by the TESS Science Processing Operations Center (SPOC).
See Section 3.
We observed TOI-6255 with the Keck Planet Finder (KPF) from
2023-May-22 to November 24, for a total of 91 exposures. KPF covers
the wavelength range of 445-870nm with a resolving power of 98000.
The exposure time of observations was 10 minutes. We achieved a
typical S/N of 87 at 550nm. See Section 4.1
TOI-6255 was also observed with CARMENES (the Calar Alto
high-Resolution search for M dwarfs with Exoearths with Near-infrared
and optical Echelle Spectrographs), located at the 3.5m telescope of
the Calar Alto Observatory, Almeria, Spain. CARMENES is a dual-channel
spectrograph: the optical channel (VIS) covers the wavelength range
from 0.52 to 0.96um (R=94600), and the near-infrared channel (NIR)
covers from 0.96 to 1.71um (R=80400). We obtained 33 high-resolution
spectra between 2023 June 24 and August 8. The exposure time was
30min, and the typical median S/N achieved in the visible channel was
about 68. See Section 4.2.
Objects:
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RA (ICRS) DE Designation(s)
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22 06 00.66 +39 18 02.8 TOI-6255 = TIC 261135533
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
keck.dat 28 91 Keck/KPF RVs of TOI-6255 (Tables 3 and 4)
carmenes.dat 28 33 CARMENES RVs of TOI-6255 (Table 5)
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See also:
J/AJ/145/102 : Sp. of bright M dwarfs in the northern sky (Lepine+, 2013)
J/A+A/555/A58 : New Kepler planetary candidates (Ofir+, 2013)
J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)
J/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/A+A/561/A138 : Transiting planets search (Ofir+, 2014)
J/ApJ/787/47 : 106 Kepler ultra-short-period planets (Sanchis-Ojeda+, 2014)
J/ApJ/808/13 : XO-2S and XO-2N chemical composition (Ramirez+, 2015)
J/A+A/597/A47 : CARMENES input cat. of M dwarfs II (Cortes-Contreras+ 2017)
J/ApJ/844/102 : KIC star plxs from asteroseismology vs Gaia (Huber+, 2017)
J/ApJ/836/77 : High-S/N optical spectra of FGKM stars (Yee+, 2017)
J/A+A/612/A95 : K2-141 b radial velocity and light curve (Barragan+, 2018)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/A+A/615/A39 : Exoplanets interior structures (Kellermann+, 2018)
J/AJ/155/165 : Dissipation in exoplanet hosts (Penev+, 2018)
J/ApJ/871/63 : How to constrain your M dwarf. II. Nearby bin. (Mann+, 2019)
J/A+A/625/A68 : Radii and masses of the CARMENES targets (Schweitzer+, 2019)
J/A+A/642/A115 : CARMENES input catalogue of M dwarfs. V. (Cifuentes+, 2020)
J/A+A/642/A115 : CARMENES input catalogue of M dwarfs. V. (Cifuentes+, 2020)
J/A+A/636/A74 : HARPS radial velocity database (Trifonov+, 2020)
J/A+A/656/A162 : CARMENES stellar atmospheric parameters (Marfil+, 2021)
J/other/NatAs/5.1163S : Sun-like stars abundances (Spina+, 2021)
J/other/NatAs/5.1163 : Sun-like stars abundances (Spina+, 2021)
J/AJ/164/215 : Candidate members of Cep-Her, RSG-5 and CH-2 (Bouma+, 2022)
J/A+A/657/A66 : List of FeI and FeII used for SteParSyn (Tabernero+, 2022)
J/A+A/680/A73 : CARMENES M dwarf template library (Nagel+ 2023)
J/other/Nat/627.501 : Co-moving pair of stars abundances (Liu+, 2024)
Byte-by-byte Description of file: keck.dat carmenes.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD [2460087/2460272.9] Barycentric Julian Date
18- 23 F6.2 m/s RV [-21.5/21.5] Radial velocity
25- 28 F4.2 m/s e_RV [0.7/4.3] RV uncertainty
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 21-Nov-2024