J/A+A/644/A127 LP714-47 (TOI 442) radial velocity curve (Dreizler+, 2020)
The CARMENES search for exoplanets around M dwarfs:
LP714-47b (TOI442.01): Populating the Neptune desert.
Dreizler S., Crossfield I.J.M., Kossakowski D., Plavchan P., Jeffers S.V.,
Kemmer J., Luque R., Espinoza N., Palle E., Stassun K., Matthews E.,
Cale B., Caballero J.A., Schlecker M., Lillo-Box J., Zechmeister M.,
Lalitha S., Reiners A., Soubkiou A., Bitsch B., Zapatero Osorio M.R.,
Chaturvedi P., Hatzes A.P., Ricker G., Vanderspek R., Latham D.W.,
Seager S., Winn J., Jenkins J.M., Aceituno J., Amado P.J., Barkaoui K.,
Barbieri M., Batalha N.M., Bauer F.F., Benneke B., Benkhaldoun Z.,
Beichman C., Berberian J., Burt J., Butler R.P., Caldwell D.A., Chintada A.,
Chontos A., Christiansen J.L., Ciardi D.R., Cifuentes C., Collins K.A.,
Collins K.I., Combs D., Cortes-Contreras M., Crane J.D., Daylan T.,
Dragomir D., Esparza-Borges E., Evans P., Feng F., Flowers E.E., Fukui A.,
Fulton B., Furlan E., Gaidos E., Geneser C., Giacalone S., Gillon M.,
Gonzales E., Gorjian V., Hellier C., Hidalgo D., Howard A.W., Howell S.,
Huber D., Isaacson H., Jehin E., Jensen E.L.N., Kaminski A., Kane S.R.,
Kawauchi K., Kielkopf J.F., Klahr H., Kosiarek M.R., Kreidberg L.,
Kuerster M., Lafarga M., Livingston J., Louie D., Mann A.,
Madrigal-Aguado A., Matson R.A., Mocnik T., Morales J.C., Muirhead P.S.,
Murgas F., Nandakumar S., Narita N., Nowak G., Oshagh M., Parviainen H.,
Passegger V.M., Pollacco D., Pozuelos F.J., Quirrenbach A., Reefe M.,
Ribas I., Robertson P., Rodriguez-Lopez C., Rose M.E., Roy A.,
Schweitzer A., Schlieder J., Shectman S., Tanner A., Senavci H.V., Teske J.,
Twicken J.D., Villasenor J., Wang S.X., Weiss L.M., Wittrock J., Yilmaz M.,
Zohrabi F.
<Astron. Astrophys. 644, A127 (2020)>
=2020A&A...644A.127D 2020A&A...644A.127D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Exoplanets ; Radial velocities
Keywords: methods: data analysis - planetary systems - stars: late-type -
stars: individual: LP714-47 -
planets and satellites: individual: LP 714-47 b
Abstract:
We report the discovery of a Neptune-like planet (LP714-47b,
P=4.05204d, m=30.8±1.5 MEarth, r=4.7±0.3 REarth) located in
the 'hot Neptune desert'. Confirmation of the TESS Object of Interest
(TOI 442.01) was achieved with radial-velocity follow-up using
CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well as from
photometric data using TESS, Spitzer, and ground-based photometry from
MuSCAT2, TRAPPIST-South, MONET-South, the George Mason University
telescope, the Las Cumbres Observatory Global Telescope network, the
El Sauce telescope, the TUBITAK National Observatory, the University
of Louisville Manner Telescope, and WASP-South. We also present
high-spatial resolution adaptive optics imaging with the Gemini
Near-Infrared Imager.
The low uncertainties in the mass and radius determination place
LP714-47b among physically well-characterised planets, allowing for a
meaningful comparison with planet structure models. The host star
LP714-47 is a slowly rotating early M dwarf (Teff=3950±51K) with a
mass of 0.59±0.02M☉ and a radius of 0.58±0.02R☉. From
long-term photometric monitoring and spectroscopic activity
indicators, we determine a stellar rotation period of about 33d. The
stellar activity is also manifested as correlated noise in the
radial-velocity data. In the power spectrum of the radial-velocity
data, we detect a second signal with a period of 16 days in addition
to the four-day signal of the planet. This could be shown to be a
harmonic of the stellar rotation period or the signal of a second
planet. It may be possible to tell the difference once more TESS data
and radial-velocity data are obtained.
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 obtained High-resolution follow-up spectroscopy for LP714-47 with
CARMENES-VIS, CARMENES-NIR, ESPRESSO, HIRES, iSHELL, and PFS. The
observations began at mid February 2019, just after the announcement
of the transiting planet candidate, and ended in January 2020. In this
period, we collected 102 spectra. The spectral resolution and the
number of spectra obtained by the individual instruments are listed in
Table 1 of the paper.
The table contains the time of observation as Barycentric Julian Date
in units of days, the measure radial velocities in unites of m/s, the
measurement uncertainties measured in m/s, and the instrument name.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
04 16 45.60 -12 05 02.5 LP714-47 = G 160-62
-------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
rv.dat 42 114 Radial velocities of LP714-47
--------------------------------------------------------------------------------
Byte-by-byte Description of file: rv.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d BJD Barycentric Julian date of observation
15- 21 F7.2 m/s RV Radial velocity
22- 28 F7.2 m/s e_RV Radial velocity uncertainty
29- 42 A14 --- Inst Instrument
--------------------------------------------------------------------------------
Acknowledgements:
Stefan Dreizler, dreizler(at)astro.physik.uni-goettingen.de
(End) Patricia Vannier [CDS] 20-Nov-2020