2021A&A...650A.188A


Query : 2021A&A...650A.188A

2021A&A...650A.188A - Astronomy and Astrophysics, volume 650A, 188-188 (2021/6-1)

The CARMENES search for exoplanets around M dwarfs. Two terrestrial planets orbiting G 264-012 and one terrestrial planet orbiting Gl 393.

AMADO P.J., BAUER F.F., RODRIGUEZ LOPEZ C., RODRIGUEZ E., CARDONA GUILLEN C., PERGER M., CABALLERO J.A., LOPEZ-GONZALEZ M.J., MUNOZ RODRIGUEZ I., POZUELOS F.J., SANCHEZ-RIVERO A., SCHLECKER M., QUIRRENBACH A., RIBAS I., REINERS A., ALMENARA J., ASTUDILLO-DEFRU N., AZZARO M., BEJAR V.J.S., BOHEMANN R., BONFILS X., BOUCHY F., CIFUENTES C., CORTES-CONTRERAS M., DELFOSSE X., DREIZLER S., FORVEILLE T., HATZES A.P., HENNING T., JEFFERS S.V., KAMINSKI A., KURSTER M., LAFARGA M., LODIEU N., LOVIS C., MAYOR M., MONTES D., MORALES J.C., MORALES N., MURGAS F., ORTIZ J.L., PALLE E., PEPE F., PERDELWITZ V., POLLACO D., SANTOS N.C., SCHOFER P., SCHWEITZER A., SEGRANSAN N.C., SHAN Y., STOCK S., TAL-OR L., UDRY S., ZAPATERO OSORIO M.R. and ZECHMEISTER M.

Abstract (from CDS):

We report the discovery of two planetary systems, namely G 264-012, an M 4.0 dwarf with two terrestrial planets (Mbsini=2.50–0.30+0.29M and Mcsini=3.75–0.47+0.488M), and Gl 393, a bright M 2.0 dwarf with one terrestrial planet (Mbsini=1.71±0.24M). Although both stars were proposed to belong to young stellar kinematic groups, we estimate their ages to be older than about 700 Ma. The two planets around G 264-012 were discovered using only radial-velocity (RV) data from the CARMENES exoplanet survey, with estimated orbital periods of 2.30d and 8.05d, respectively.Photometric monitoring and analysis of activity indicators reveal a third signal present in the RV measurements, at about 100d,caused by stellar rotation. The planet Gl 393 b was discovered in the RV data from the HARPS, CARMENES, and HIRES instruments. Its identification was only possible after modelling, with a Gaussian process (GP), the variability produced by the magnetic activity of the star. For the earliest observations, this variability produced a forest of peaks in the periodogram of the RVs at around the 34d rotation period determined from Kepler data, which disappeared in the latestepochs. After correcting for them with this GP model, a significant signal showed at a period of 7.03d. No significant signals in any of our spectral activity indicators or contemporaneous photometry were found at any of the planetary periods. Given the orbital and stellar properties, the equilibrium temperatures of the three planets are all higher than that for Earth. Current planet formation theories suggest that these two systems represent a common type of architecture. This is consistent with formation following the core accretion paradigm.

Abstract Copyright: © ESO 2021

Journal keyword(s): planets and satellites: detection - planets and satellites: individual: G 264-012 b - planets and satellites: individual: G 264-012 c - planets and satellites: individual: Gl 393 b

VizieR on-line data: <Available at CDS (J/A+A/650/A188): tableb1.dat tableb2.dat>

Simbad objects: 18

goto Full paper

goto View the references in ADS

Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3409 0
2 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3048 0
3 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 470 0
4 * alf Gem ** 07 34 35.87319 +31 53 17.8160 1.64 1.62 1.58 1.51 1.52 A1V+A2Vm 260 0
5 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 816 0
6 NAME G 234-45b Pl 08 41 20.1286588424 +59 29 50.444062516           ~ 25 0
7 NAME GJ 393 b Pl? 10 28 55.5512830314 +00 50 27.598904576           ~ 5 0
8 BD+01 2447 PM* 10 28 55.5512830314 +00 50 27.598904576 12.389 11.151 9.650 8.617 7.389 dM2 308 0
9 G 122-49 PM* 11 50 57.7205259231 +48 22 38.561183125       12.95   M4.5V 117 0
10 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 438 2
11 Wolf 437 EB* 12 47 56.6245693190 +09 45 05.035666747 14.088 12.958 11.395 10.235 8.707 M3.5V 148 0
12 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1281 0
13 NAME Proxima Centauri b Pl 14 29 42.9461331854 -62 40 46.164680672           ~ 356 0
14 NAME G 264-012 b Pl? 21 46 40.2407357179 +66 48 10.646948698           ~ 3 0
15 G 264-12 PM* 21 46 40.2407357179 +66 48 10.646948698   14.66   12.740   M4.0V 44 0
16 NAME G 264-012 c Pl? 21 46 40.2407357179 +66 48 10.646948698           ~ 4 0
17 NAME IC 2391 Moving Group MGr ~ ~           ~ 26 0
18 NAME Pleiades Moving Group MGr ~ ~           ~ 277 1

To bookmark this query, right click on this link: simbad:objects in 2021A&A...650A.188A and select 'bookmark this link' or equivalent in the popup menu