Access to Astronomical Catalogues

← Click to display the menu
J/A+A/613/A25       Radial velocity for Ross 128              (Bonfils+, 2018)

A temperate exo-Earth around a quiet M dwarf at 3.4 parsecs. Bonfils X., Astudillo-Defru N., Diaz R., Almenara J.-M., Forveille T., Bouchy F., Delfosse X., Lovis C., Mayor M., Murgas F., Pepe F., Santos N. C., Segransan D., Udry S., Wunsche A. <Astron. Astrophys. 613, A25 (2018)> =2018A&A...613A..25B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities Keywords: planetary systems - stars: late-type - techniques: radial velocities Abstract: After that a new technique combining high-contrast imaging and high-dispersion spectroscopy successfully detected the atmosphere of a giant planet, it soon became contemplated as one of the most promising avenues to study the atmosphere of Earth-size worlds. With the forthcoming ELTs, it shall gain the angular resolution and sensitivity to even detect O2 in the atmosphere of planets orbiting red dwarfs. This is a strong motivation to make the census of planets around cool stars which habitable zones can be resolved by ELTs, i.e. for M dwarfs within ∼5-parsecs. In that context, our HARPS survey is already a major contributor to that sample of nearby planets. Here we report on our radial-velocity observations of Ross 128 (Proxima Virginis, GJ447, HIP 57548), a M4 dwarf just 3.4-parsec away from our Sun. We detect it is host of an exo-Earth with a projected mass m*sini=1.35M and an orbital period of 9.9-days. Ross 128 b receives ∼1.38 as much flux as Earth from the Sun and has an equilibrium temperature between 269K (resp. 213K) for an Earth-like (resp. Venus-like) albedo. According to recent studies, it is located at the inner edge of the so called habitable zone. An 80-day long light curve performed by K2 during campaign C01 excludes Ross 128 b is a transiting planet. Together with ASAS photometry and other activity indices, it argues for a long rotational period and a weak activity which, in the context of habitability, gives a high merit to the detection. Today, Ross 128 b is the second closest known exo-Earth after Proxima Centauri b (1.3 parsec) and the closest known temperate planet around a quiet star. At maximum elongation, the planet-star angular separation of 15 milli-arcsec will be resolved by the ELT (>3λ/D) in all optical bands of O2. Description: The tables contain radial-velocity time series of Ross 128. Radial velocities were obtained with he HARPS spectrograph on the 3.6m telescope at La Silla, Chile. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 11 47 44.4 +00 48 16 Ross 128 = V* FI Vir -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 34 159 HARPS measured RV for Ross 128
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 14 F14.6 d BJD Barycentric Julian date 16- 24 F9.5 km/s RV Barycentric radial velocity 26- 32 F7.5 km/s e_RV Radial-velocity uncertainty 34 I1 --- Inst [1/2] Instrument upgrade flag
Acknowledgements: Xavier Bonfils, xavier.bonfils(at)
(End) Xavier Bonfils [IPAG], Patricia Vannier [CDS] 30-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© Université de Strasbourg/CNRS

    • Contact