SIMBAD references

2021AJ....162..174C - Astron. J., 162, 174-174 (2021/November-0)

A more precise mass for GJ 1214 b and the frequency of multiplanet systems around mid-M dwarfs.


Abstract (from CDS):

We present an intensive effort to refine the mass and orbit of the enveloped terrestrial planet GJ 1214 b using 165 radial velocity (RV) measurements taken with the HARPS spectrograph over a period of 10 years. We conduct a joint analysis of the RVs with archival Spitzer/IRAC transits and measure a planetary mass and radius of 8.17 ± 0.43 M and 2.742–0.053+0.050R. Assuming that GJ 1214 b is an Earth-like core surrounded by a H/He envelope, we measure an envelope mass fraction of Xenv = 5.24–0.29+0.30%. GJ 1214 b remains a prime target for secondary eclipse observations of an enveloped terrestrial, the scheduling of which benefits from our constraint on the orbital eccentricity of <0.063 at 95% confidence, which narrows the secondary eclipse window to 2.8 hr. By combining GJ 1214 with other mid-M-dwarf transiting systems with intensive RV follow up, we calculate the frequency of mid-M-dwarf planetary systems with multiple small planets and find that 90–21+5% of mid-M dwarfs with a known planet with mass ∈ [1, 10] M and orbital period ∈ [0.5, 50] days, will host at least one additional planet. We rule out additional planets around GJ 1214 down to 3 M within 10 days, such that GJ 1214 is a single-planet system within these limits. This result has a 44–5+9 probability given the prevalence of multiplanet systems around mid-M dwarfs. We also investigate mid-M-dwarf RV systems and show that the probability that all reported RV planet candidates are real planets is <12% at 99% confidence, although this statistical argument is unable to identify the probable false positives.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanets - Exoplanet structure - M dwarf stars - Radial velocity - Transits

VizieR on-line data: <Available at CDS (J/AJ/162/174): table2.dat>

Simbad objects: 37

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