J/A+A/642/A236 GJ 3473 (TOI-488) radial velocity curve (Kemmer+, 2020)
Discovery of a hot, transiting, Earth-sized planet and a second temperate,
non-transiting planet around the M4 dwarf GJ 3473 (TOI-488).
Kemmer J., Stock S., Kossakowski D., Kaminski A., Molaverdikhani K.,
Schlecker M., Caballero J.A., Amado P. J., Astudillo-Defru N., Bonfils X.,
Ciardi D., Collins K.A., Espinoza N., Fukui A., Hirano T., Jenkins J.M.,
Latham D.W., Matthews E.C., Narita N., Palle E., Parviainen H.,
Quirrenbach A., Reiners A., Ribas I., Ricker G., Schlieder J.E., Seager S.,
Vanderspek R., Winn J.N., Almenara J.M., Bejar V.J.S., Bluhm P., Bouchy F.,
Boyd P., Christiansen J.L., Cifuentes C., Cloutier R., Collins K.I.,
Cortes-Contreras M., I.J.M. Crossfield, Crouzet N., de Leon J.P.,
Della-Rose D.D., Delfosse X., Dreizler S., Esparza-Borges E., Essack Z.,
Forveille T., Figueira P., Galadi-Enriquez D., Gan T., Glidden A.,
Gonzales E.J., Guerra P., Harakawa H., Hatzes A.P., Henning T., Herrero E.,
Hodapp K., Hori Y., Howell S.B., Ikoma M., Isogai K., Jeffers S.V.,
Kuerster M., Kawauchi K., Kimura T., Klagyivik P., Kotani T., Kurokawa T.,
Kusakabe N., Kuzuhara M., Lafarga M., Livingston J.H., Luque R., Matson R.,
Morales J.C., Mori M., Muirhead P.S., Murgas F., Nishikawa J., Nishiumi T.,
Omiya M., Reffert S., Rodriguez Lopez C., Santos N.C., Schoefer P.,
Schwarz R.P., Shiao B., Tamura M., Terada Y., Twicken J.D., Ueda A.,
Vievard S., Watanabe N., Zechmeister M.
<Astron. Astrophys. 642, A236 (2020)>
=2020A&A...642A.236K 2020A&A...642A.236K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities
Keywords: planetary systems - planets and satellites: detection -
techniques: radial velocities - techniques: photometric -
stars: late-type - stars: individual: G 50-16
Abstract:
We present the confirmation and characterisation of GJ 3473 b
(G 50-16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf
star, whose transiting signal (P=1.1980035±0.0000018d) was first
detected by the Transiting Exoplanet Survey Satellite (TESS). Through
a joint modelling of follow-up radial velocity observations with
CARMENES, IRD, and HARPS together with extensive ground-based
photometric follow-up observations with LCOGT, MuSCAT, and MuSCAT2, we
determined a precise planetary mass, Mb=1.86±0.30M☉, and
radius, Rb=1.264±0.050R☉. Additionally, we report the
discovery of a second, temperate, non-transiting planet in the system,
GJ 3473 c, which has a minimum mass, Mcsini=7.41±0.91M☉ and
orbital period, Pc=15.509±0.033d. The inner planet of the system,
GJ 3473 b, is one of the hottest transiting Earth- sized planets known
thus far, accompanied by a dynamical mass measurement, which makes it
a particularly attractive target for thermal emission spectroscopy.
Description:
High-resolution follow-up spectroscopy of the TESS planet candidates
is arranged by the TESS follow-up programme (TFOP), "Precise Radial
Velocities" SG4 subgroup.
We observed GJ 3473 with CARMENES. The observations began at the end
of March 2019, just after the announcement of the transiting planet
candidate, and ended in January 2020. In this period, we collected 67
pairs of VIS and NIR spectra with exposure times of about 30 min each.
In the course of the Subaru IRD TESS Intensive Follow-up Project
(proposal S19A-069I), we observed GJ 3473 with the InfraRed Doppler
spectrograph (IRD). A total of 56 frames were acquired for GJ 3473 by
IRD on 12 different nights between April 2019 and December 2019.
GJ 3473 was also observed by the High Accuracy Radial velocity Planet
Searcher (HARPS). The 32 observations presented here were taken
between May 2019 and March 2020.
Objects:
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RA (2000) DE Designation(s)
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08 02 22.8 +03 20 19.7 GJ 3473 = G 50-16
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 148 Radial velocities of GJ 3473
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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- 15 F15.7 d BJD Barycentric Julian date of observation
17- 37 F21.17 km/s RV Radial velocity
39- 57 F19.16 km/s e_RV Radial velocity uncertainty
59- 66 A8 --- Inst Instrument
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Acknowledgements:
Jonas Kemmer, jkemmer(at)lsw.uni-heidelberg.de
(End) Patricia Vannier [CDS] 25-Sep-2020