J/A+A/628/A39 Radial velocities of GJ 357 (Luque+, 2019)
Planetary system around the nearby M dwarf GJ 357 including a transiting, hot,
Earth-sized planet optimal for atmospheric characterization.
Luque R., Palle E., Kossakowski D., Dreizler S., Kemmer J., Espinoza N.,
Burt J., Anglada-Escude G., Bejar V.J.S., Caballero J.A., Collins K.A.,
Collins K.I., Cortes-Contreras M., Diez-Alonso E., Feng F., Hatzes A.,
Hellier C., Henning T., Jeffers S.V., Kaltenegger L., Kuerster M.,
Madden J., Molaverdikhani K., Montes D., Narita N., Nowak G., Ofir A.,
Oshagh M., Parviainen H., Quirrenbach A., Reffert S., Reiners A.,
Rodriguez-Lopez C., Schlecker M., Stock S., Trifonov T., Winn J.N.,
Zapatero Osorio M.R., Zechmeister M., Amado P.J., Anderson D.R.,
Batalha N.E., Bauer F.F., Bluhm P., Burke C.J., Butler R.P., Caldwell D.A.,
Chen G., Crane J.D., Dragomir D., Dressing C.D., Dynes S., Jenkins J.M.,
Kaminski A., Klahr H., Kotani T., Lafarga M., Latham D.W., Lewin P.,
McDermott S., Montanes-Rodriguez P., Morales J.C., Murgas F., Nagel E.,
Pedraz S., Ribas I., Ricker G.R., Rowden P., Seager S., Shectman S.A.,
Tamura M., Teske J., Twicken J.D., Vanderspeck R., Wang S.X., Wohler B.
<Astron. Astrophys. 628, A39 (2019)>
=2019A&A...628A..39L 2019A&A...628A..39L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities
Keywords: planetary systems - techniques: photometric -
techniques: radial velocities - stars: individual: GJ 357 -
stars: late-type
Abstract:
We report the detection of a transiting Earth-size planet around
GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet
Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot,
Earth-sized planet (Teq=525±11K) with a radius of
Rb=1.217±0.084R⊕ and an orbital period of Pb=3.93d.
Precise stellar radial velocities from CARMENES and PFS, as well as
archival data from HIRES, UVES, and HARPS also display a 3.93-day
periodicity, confirming the existence of the planet and leading to a
planetary mass of Mb=1.84±0.31M⊕. In addition to the
radial velocity signal for GJ 357 b, more periodicities are present in
the data indicating the presence of two more planets in the system:
GJ 357 c, with a minimum mass of Mc=3.40±0.46M⊕ in a 9.12d
orbit, and GJ 357 d, with a minimum mass of Md=6.1±1.0M⊕
in a 55.7d orbit inside the habitable zone. The host is relatively
inactive and exhibits a photometric rotation period of Prot=78±2d.
GJ 357 b is to date the second closest transiting planet to the Sun,
making it a prime target for further investigations such as
transmission spectroscopy. Therefore, GJ 357 b represents one of the
best terrestrial planets suitable for atmospheric characterization
with the upcoming JWST and ground-based ELTs.
Description:
Radial velocities of GJ 357 from HIRES (Vogt et al., 1994, in Proc.
SPIE, Vol. 2198, 362), UVES (programs 072.C-0495, 078.C-0829, and
173.C-0606), HARPS (Mayor et al., 2003Msngr.114...20M 2003Msngr.114...20M; programs
072.C-0488, 183.C-0437), CARMENES (Quirrenbach et al., 2016, in Proc.
SPIE, Vol. 9147,91471F; 2018, in Society of Photo-Optical
Instrumentation Engineers (SPIE) Conference Series, Vol. 10702,
107020W), and PFS (Crane et al., 2010aepr.confE..19C).
Objects:
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RA (2000) DE Designation(s)
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09 36 01.64 -21 39 38.9 GJ 357 = HIP 47103
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 141 GJ 357 radial velocities
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date of observation
16- 21 F6.2 m/s RV Radial velocity
24- 27 F4.2 m/s e_RV Radial velocity uncertainty
29- 36 A8 -- Inst Instrument (1)
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Note (1): Instruments are CARMENES, HARPS, HIRES, PFSpost, PFSpre and UVES.
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Acknowledgements:
Rafael Luque, rluque(at)iac.es
(End) Rafael Luque [IAC, Spain], Patricia Vannier [CDS] 09-Jul-2019