J/ApJ/876/L24 HARPS radial velocities of the host star HD15337 (Gandolfi+, 2019)
The transiting multi-planet system HD15337: two nearly equal-mass planets
straddling the radius gap.
Gandolfi D., Fossati L., Livingston J.H., Stassun K.G., Grziwa S.,
Barragan O., Fridlund M., Kubyshkina D., Persson C.M., Dai F., Lam K.W.F.,
Albrecht S., Batalha N., Beck P.G., Bo Justesen A., Cabrera J.,
Cartwright S., Cochran W.D., Csizmadia S., Davies M.D., Deeg H.J.,
Eigmuller P., Endl M., Erikson A., Esposito M., Garcia R.A., Goeke R.,
Gonzalez-Cuesta L., Guenther E.W., Hatzes A.P., Hidalgo D., Hirano T.,
Hjorth M., Kabath P., Knudstrup E., Korth J., Li J., Luque R., Mathur S.,
Montanes Rodriguez P., Narita N., Nespral D., Niraula P., Nowak G.,
Palle E., Patzold M., Prieto-Arranz J., Rauer H., Redfield S., Ribas I.,
Skarka M., Smith A.M.S., Rowden P., Torres G., Van Eylen V., Vezie M.L.
<Astrophys. J., 876, L24 (2019)>
=2019ApJ...876L..24G 2019ApJ...876L..24G
ADC_Keywords: Stars, K-type; Radial velocities; Spectra, optical
Keywords: planetary systems ; planets and satellites: detection ;
planets and satellites: fundamental parameters ;
planets and satellites: individual (HD15337 b , c) ;
stars: fundamental parameters
Abstract:
We report the discovery of a super-Earth and a sub-Neptune transiting
the star HD 15337 (TOI-402, TIC 120896927), a bright (V=9) K1 dwarf
observed by the Transiting Exoplanet Survey Satellite (TESS) in
Sectors 3 and 4. We combine the TESS photometry with archival High
Accuracy Radial velocity Planet Searcher spectra to confirm the
planetary nature of the transit signals and derive the masses of the
two transiting planets. With an orbital period of 4.8d, a mass of
7.51-1.01+1.09^M⊕_ and a radius of 1.64±0.06R⊕,
HD15337b joins the growing group of short-period super-Earths known to
have a rocky terrestrial composition. The sub-Neptune HD15337c has an
orbital period of 17.2d, a mass of 8.11-1.69+1.82M⊕, and a
radius of 2.39±0.12R⊕, suggesting that the planet might be
surrounded by a thick atmospheric envelope. The two planets have
similar masses and lie on opposite sides of the radius gap, and are
thus an excellent testbed for planet formation and evolution theories.
Assuming that HD15337c hosts a hydrogen-dominated envelope, we employ
a recently developed planet atmospheric evolution algorithm in a
Bayesian framework to estimate the history of the high-energy (extreme
ultraviolet and X-ray) emission of the host star. We find that at an
age of 150Myr, the star possessed on average between 3.7 and 127 times
the high-energy luminosity of the current Sun.
Description:
HD 15337 (TIC 120896927) was observed by the Transiting Exoplanet
Survey Satellite (TESS) Camera #2 in Sectors 3 and 4 (charge-coupled
devices #3 and #4, respectively) from 2018 September 20 to November 15,
and will not be observed further during the nominal two-year TESS mission.
TOIs 402.01 (HD 15337 b) and 402.02 (HD 15337 c) were announced on
2019 January 16 and 31, respectively, in association with the HD 15337
photometry. See Section 2.
HD 15337 was observed between 2003 December 15 and 2017 September 6 UT
with the High Accuracy Radial velocity Planet Searcher (HARPS)
spectrograph (R∼115000) mounted at the European Southern Observatory
(ESO)-3.6m telescope, as part of the observing programs 072.C-0488,
183.C-0972, 192.C-0852, 196.C-1006, and 198.C-0836. We retrieved the
publicly available reduced spectra from the ESO archive.
Objects:
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RA (ICRS) DE Designation(s)
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02 27 28.38 -27 38 06.7 HD 15337 = TYC 6435-434-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 54 52 HARPS RV measurements of HD15337 acquired with
the old fiber bundle
table3.dat 54 35 HARPS RV measurements of HD15337 acquired with
the new fiber bundle
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/ApJ/726/L19 : Gunn r photometry of WASP-30 (Anderson+, 2011)
J/PASP/124/1279 : Q3 Kepler's combined photometry (Christiansen+, 2012)
J/A+A/566/A66 : logIHα & logR'HK correlation (Gomes da Silva+, 2014)
J/A+A/580/A23 : Stroemgren-Crawford uvbyβ photometry (Paunzen, 2015)
J/AJ/152/204 : HARPS-N radial velocities of HD 179070 (Lopez-Morales+, 2016)
J/AJ/152/180 : Bol. fluxes of eclipsing binaries in Tycho-2 (Stassun+, 2016)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/AJ/154/109 : CKS. III. Planet radii (Fulton+, 2017)
J/AJ/154/123 : RV follow-up of the HD 3167 system (Gandolfi+, 2017)
J/A+A/608/A93 : K2-106 radial velocities measurements (Guenther+, 2017)
J/AJ/153/136 : Planets & host stars with Gaia parallaxes (Stassun+, 2017)
J/A+A/612/A95 : K2-141 b radial velocity and light curve (Barragan+, 2018)
J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)
J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)
J/A+A/622/L7 : GJ143 and HD23472 radial velocity curves (Trifonov+, 2019)
Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD [2988.6/8002.9] Barycentric Julian Date in
barycentric dynamical time (BDT), BJD-2450000
13- 13 A1 --- Flag Exclusion flag; *=outlier not included
in the analysis
15- 21 F7.4 km/s RV [-3.83/-1.6] Radial Velocity
23- 28 F6.4 km/s e_RV [0.0005/0.04] Uncertainty in RV
30- 36 F7.4 km/s BIS [-0.003/0.12] Bisector span
38- 43 F6.4 km/s FWHM [6.1/6.4] Full-width at half-maximum
45- 48 I4 s Texp [5/1500] Exposure time
50- 54 F5.1 --- S/N [3.8/142.1] S/N per pixel at 550nm
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Nov-2020