E-resources
Peer reviewed
Open access
-
Caballero, J A; González-Álvarez, E; Brady, M; Trifonov, T; Ellis, T G; Dorn, C; Cifuentes, C; Molaverdikhani, K; Bean, J L; Boyajian, T; Rodríguez, E; Sanz-Forcada, J; Osorio, M R Zapatero; Abia, C; Amado, P J; Anugu, N; Béjar, V J S; Davies, C L; Dreizler, S; Dubois, F; Ennis, J; Espinoza, N; Farrington, C D; López, A García; Gardner, T; Hatzes, A P; Henning, Th; Herrero, E; Herrero-Cisneros, E; Kaminski, A; Kasper, D; Klement, R; Kraus, S; Labdon, A; Lanthermann, C; Bouquin, J -B Le; González, M J López; Luque, R; Mann, A W; Marfil, E; Monnier, J D; Montes, D; Morales, J C; Pallé, E; Pedraz, S; Quirrenbach, A; Reffert, S; Reiners, A; Ribas, I; Rodriguez-Lopez, C; Schaefer, G; Schweitzer, A; Seifahrt, A; Setterholm, B R; Shan, Y; Shulyak, D; Solano, E; Sreenivas, K R; Stefánsson, G; Stürmer, J; Tabernero, H M; Tal-Or, L; Brummelaar, T ten; Vanaverbeke, S; Braun, K von; Youngblood, A; Zechmeister, M
Astronomy and astrophysics (Berlin), 09/2022, Volume: 665Journal Article
Context. The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5V star at just 8 pc with a warm transiting rocky planet of about 1.3 R⨁ and 3.0 M⨁. It is ideal for both transmission and emission spectroscopy and for testing interior models of telluric planets. Aims. To prepare for future studies, we aim to thoroughly characterise the planetary system with new accurate and precise data collected with state-of-the-art photometers from space and spectrometers and interferometers from the ground. Methods. We collected light curves of seven new transits observed with the CHEOPS space mission and new radial velocities obtained with MAROON-X at the 8.1m Gemini North telescope and CARMENES at the 3.5m Calar Alto telescope, together with previously published spectroscopic and photometric data from the two spectrographs and TESS. We also performed near-infrared interferometric observations with the CHARA Array and new photometric monitoring with a suite of smaller telescopes (AstroLAB, LCOGT, OSN, TJO). This extraordinary and rich data set was the input for our comprehensive analysis. Results. From interferometry, we measure a limb-darkened disc angular size of the star Gl 486 at θLDD = 0.390 ± 0.018 mas. Together with a corrected Gaia EDR3 parallax, we obtain a stellar radius R* = 0.339 ± 0.015 R⨀. We also measure a stellar rotation period at Prot = 49.9 ± 5.5 days, an upper limit to its XUV (5–920 Å) flux informed by new Hubble/STIS data, and, for the first time, a variety of element abundances (Fe, Mg, Si, V, Sr, Zr, Rb) and C/O ratio. Moreover, we imposed restrictive constraints on the presence of additional components, either stellar or sub-stellar, in the system. With the input stellar parameters and the radial-velocity and transit data, we determine the radius and mass of the planet Gl 486 b at Rp = 1.343+0.063-0.062 R⨀ and Mp = 3.00+0.13-0.13 M⨁, with relative uncertainties of the planet radius and mass of 4.7% and 4.2%, respectively. From the planet parameters and the stellar element abundances, we infer the most probable models of planet internal structure and composition, which are consistent with a relatively small metallic core with respect to the Earth, a deep silicate mantle, and a thin volatile upper layer. With all these ingredients, we outline prospects for Gl 486 b atmospheric studies, especially with forthcoming James Webb Space Telescope (Webb) observations.
Author
![loading ... loading ...](themes/default/img/ajax-loading.gif)
Shelf entry
Permalink
- URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year | Impact factor | Edition | Category | Classification | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Select the library membership card:
If the library membership card is not in the list,
add a new one.
DRS, in which the journal is indexed
Database name | Field | Year |
---|
Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
---|
Source: Personal bibliographies
and: SICRIS
The material is available in full text. If you wish to order the material anyway, click the Continue button.