J/AJ/162/238 Radial velocity follow up of Wolf 503 (Polanski+, 2021)
Wolf 503 b: characterization of a sub-Neptune orbiting a metal-poor K dwarf.
Polanski A.S., Crossfield I.J.M., Burt J.A., Nowak G., Lopez-morales M.,
Mortier A., Poretti E., Behmard A., Benneke B., Blunt S., Bonomo A.S.,
Butler R.P., Chontos A., Cosentino R., Crane J.D., Dumusque X.,
Fulton B.J., Ghedina A., Gorjian V., Grunblatt S.K., Harutyunyan A.,
Howard A.W., Isaacson H., Kosiarek M.R., Latham D.W., Luque R.,
Martinez Fiorenzano A.F., Mayor M., Mills S.M., Molinari E., Nagel E.,
Palle E., Petigura E.A., Shectman S.A., Sozzetti A., Teske J.K., Wang S.X.,
Weiss L.M.
<Astron. J., 162, 238-238 (2021)>
=2021AJ....162..238P 2021AJ....162..238P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs; Stars, K-type; Radial velocities; Optical
Keywords: Exoplanet astronomy; Radial velocity; Transit photometry
Extrasolar gaseous planets; Ephemerides; K dwarf stars
Abstract:
Using radial-velocity measurements from four instruments, we report
the mass and density of a 2.043±0.069R⊕ sub-Neptune orbiting
the quiet K-dwarf Wolf503 (HIP67285). In addition, we present improved
orbital and transit parameters by analyzing previously unused
short-cadence K2 campaign 17 photometry and conduct a joint
radial-velocity-transit fit to constrain the eccentricity at
0.41±0.05. The addition of a transit observation by Spitzer also
allows us to refine the orbital ephemeris in anticipation of further
follow-up. Our mass determination, 6.26-0.70+0.69M⊕ , in
combination with the updated radius measurements, gives Wolf503b a
bulk density of ρ=2.92-0.44+0.50g/cm3. Using interior
composition models, we find this density is consistent with an
Earth-like core with either a substantial H2O mass fraction
(45-16+19%) or a modest H/He envelope (0.5%±0.3%). The low
H/He mass fraction, along with the old age of Wolf503 (11±2Gyr),
makes this sub-Neptune an opportune subject for testing theories of
XUV-driven mass loss while the brightness of its host (J=8.3mag) makes
it an attractive target for transmission spectroscopy.
Description:
We obtained radial velocity measurements of Wolf503 from 4
instruments: the Keck Observatory's High Resolution Echelle
Spectrometer (HIRES), the Calar Alto high-Resolution search for M
dwarfs with Exoearths with Near-infrared and optical Echelle
Spectrographs (CARMENES), the High Accuracy Radial velocity Planet
Searcher North (HARPS-N), and the Planet Finder Spectrograph (PFS).
Observations were taken from 2018 May to 2020 March, totaling 110 data
points.
Objects:
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RA (2000) DE Designation(s) (Period)
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13 47 23.44 -06 08 12.7 Wolf 503 = BD-05 3763 (P=6.00127d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 51 110 Radial velocities and SHK values
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See also:
III/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991)
II/335 : Revised catalog of GALEX UV sources (Bianchi+ 2017)
J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)
J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)
J/ApJ/734/70 : Chromospheric activity of Southern stars (Arriagada, 2011)
J/ApJ/754/136 : Light curves of HD 149026b in 3.6-16um (Stevenson+, 2012)
J/AJ/145/102 : Spectroscopy of bright M dwarfs in northern sky (Lepine+, 2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/831/64 : Mass-metallicity relation for giant planets (Thorngren+, 2016)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/AJ/154/228 : Properties of transiting planet's host stars (Sandford+, 2017)
J/ApJ/844/102 : KIC star plxs from asteroseismology vs Gaia (Huber+, 2017)
J/A+A/609/A117 : CARMENES radial velocity curves of 7 M-dwarf (Trifonov+, 2018)
J/A+A/618/A115 : HD 147379 radial velocities (Kaminski+, 2018)
J/AJ/155/89 : California-Kepler Survey (CKS). IV. Planets (Petigura+, 2018)
J/ApJ/872/17 : HAZMAT. V. UV & X-ray evolution K stars (Richey-Yowell+, 2019)
J/A+A/636/A36 : Absolute radial velocities CARMENES M dwarfs (Lafarga+, 2020)
J/AJ/159/239 : Transmission Spectroscopy Metric of exoplanets (Guo+, 2020)
J/AJ/159/280 : Gaia-Kepler stellar properties cat.I. KIC stars (Berger+, 2020)
J/AJ/161/70 : Radial velocities WASP-107 with HIRES & CORALIE (Piaulet+, 2021)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD [2458262/2458926] Barycentric Julian Date; TDB
15- 23 F9.2 m/s RVel [-46766/17] Radial velocity
25- 28 F4.2 m/s e_RVel [0.6/7] Uncertainty in RVel
30- 35 F6.4 --- SHK [0.2/0.35]? Mt. Wilson SHK index
37- 42 F6.4 --- e_SHK [0.001/0.05]? Uncertainty in SHK
44- 51 A8 --- Inst Instrument; CARMENES, HARPS, HIRES or PFS
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 18-Feb-2022