2017A&A...603A..57S


Query : 2017A&A...603A..57S

2017A&A...603A..57S - Astronomy and Astrophysics, volume 603A, 57-57 (2017/7-1)

Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE.

SAMLAND M., MOLLIERE P., BONNEFOY M., MAIRE A.-L., CANTALLOUBE F., CHEETHAM A.C., MESA D., GRATTON R., BILLER B.A., WAHHAJ Z., BOUWMAN J., BRANDNER W., MELNICK D., CARSON J., JANSON M., HENNING T., HOMEIER D., MORDASINI C., LANGLOIS M., QUANZ S.P., VAN BOEKEL R., ZURLO A., SCHLIEDER J.E., AVENHAUS H., BEUZIT J.-L., BOCCALETTI A., BONAVITA M., CHAUVIN G., CLAUDI R., CUDEL M., DESIDERA S., FELDT M., FUSCO T., GALICHER R., KOPYTOVA T.G., LAGRANGE A.-M., LE COROLLER H., MARTINEZ P., MOELLER-NILSSON O., MOUILLET D., MUGNIER L.M., PERROT C., SEVIN A., SISSA E., VIGAN A. and WEBER L.

Abstract (from CDS):

Context. 51 Eridani b is an exoplanet around a young (20Myr) nearby (29.4pc) F0-type star, which was recently discovered by direct imaging. It is one of the closest direct imaging planets in angular and physical separation (∼0.5'', ∼13au) and is well suited for spectroscopic analysis using integral field spectrographs.
Aims. We aim to refine the atmospheric properties of the known giant planet and to constrain the architecture of the system further by searching for additional companions.
Methods. We used the extreme adaptive optics instrument SPHERE at the Very Large Telescope (VLT) to obtain simultaneous dual-band imaging with IRDIS and integral field spectra with IFS, extending the spectral coverage of the planet to the complete Y- to H-band range and providing additional photometry in the K12-bands (2.11, 2.25µm). The object is compared to other known cool and peculiar dwarfs. The posterior probability distributions for parameters of cloudy and clear atmospheric models are explored using MCMC. We verified our methods by determining atmospheric parameters for the two benchmark brown dwarfs Gl 570D and HD 3651B. We used archival VLT-NACO (L') Sparse Aperture Masking data to probe the innermost region for additional companions.
Results. We present the first spectrophotometric measurements in the Y and K bands for the planet and revise its J-band flux to values 40% fainter than previous measurements. Cloudy models with uniform cloud coverage provide a good match to the data. We derive the temperature, radius, surface gravity, metallicity, and cloud sedimentation parameter fsed. We find that the atmosphere is highly super-solar ([Fe/H]=1.0±0.1dex), and the low fsed=1.26+0.36–0.29 value is indicative of a vertically extended, optically thick cloud cover with small sized particles. The model radius and surface gravity estimates suggest higher planetary masses of Mgravity= 9.1+4.9–3.3MJ. The evolutionary model only provides a lower mass limit of >2MJ (for pure hot-start). The cold-start model cannot explain the luminosity of the planet. The SPHERE and NACO/SAM detection limits probe the 51 Eri system at solar system scales and exclude brown-dwarf companions more massive than 20MJ beyond separations of ∼2.5au and giant planets more massive than 2MJ beyond 9au.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: individual: 51 Eridani - planets and satellites: atmospheres - methods: data analysis - techniques: high angular resolution - techniques: image processing - techniques: image processing

VizieR on-line data: <Available at CDS (J/A+A/603/A57): list.dat fits/*>

Simbad objects: 47

goto Full paper

goto View the reference in ADS

Number of rows : 47
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * 54 Psc B BD* 00 39 18.91 +21 15 16.8           T7.5 64 1
2 * 54 Psc PM* 00 39 21.8055114029 +21 15 01.716052732 7.29 6.71 5.88 5.21 4.82 K0.5V 541 1
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11371 1
4 V* GU Psc B BD* 01 12 36.53808 +17 04 29.9424           T3.5 54 0
5 LEHPM 1481B BD* 01 22 50.86 -24 39 51.6           L4-6 28 0
6 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 63 0
7 2MASSI J0243137-245329 BD* 02 43 13.71792 -24 53 29.8356           T6.0 43 0
8 * 51 Eri PM* 04 37 36.1323118067 -02 28 24.778826936   5.486 5.209     F0IV 187 0
9 * 51 Eri b Pl 04 37 36.1323118067 -02 28 24.778826936           ~ 116 0
10 GJ 3305 TT* 04 37 37.4507041928 -02 29 28.869007822   12.04 10.59   8.59 M1.1V 111 0
11 HD 30447 * 04 46 49.5287921615 -26 18 08.850707067   8.25 7.86   7.39 F3V 64 0
12 V* AS Col RS* 05 20 38.0483050509 -39 45 17.794216843   7.89 7.38   6.81 F6V 66 1
13 CD-35 2722B BD* 06 09 19.2082646634 -35 49 31.062882043           L0-1 55 0
14 HD 44627 Ro* 06 19 12.9129838711 -58 03 15.524890610   10.01 9.205   8.185 K1V(e) 148 1
15 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 395 0
16 HD 53842 PM* 06 46 13.5387572180 -83 59 29.516575162   8.880 8.622     F5V 61 0
17 HD 95086 * 10 57 03.0216129217 -68 40 02.446874288   7.60 7.36     A8III 140 1
18 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 66 0
19 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 251 0
20 2MASS J12373919+6526148 BD* 12 37 39.19632 +65 26 14.8092           T6.5 64 0
21 NAME VHS J1256-1257B BD* 12 56 01.83264 -12 57 27.6912           L8.0 41 0
22 VHS J1256-1257 LM* 12 56 02.15136 -12 57 21.7116     17.759   13.318 M7.0 32 0
23 ULAS J130041.74+122114.7 BD* 13 00 42.08415 +12 21 15.0536         23.28 T8.5p 105 0
24 * e Vir b Pl 13 16 46.5161591991 +09 25 26.967205938           ~ 87 1
25 2MASS J13510003+2925273 BD* 13 51 00.03024 +29 25 27.3252           T0:pec 4 0
26 2MASS J14153003+5724300 BD* 14 15 30.03456 +57 24 30.0960           L8.0+T5.0 10 0
27 ULAS J141623.94+134836.3 BD* 14 16 23.94216 +13 48 36.3204           T7.5p 40 0
28 ULAS J142320.79+011638.2 BD* 14 23 20.79 +01 16 38.2           T8 21 0
29 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 198 1
30 HD 131976 SB* 14 57 26.53330 -21 24 41.5778 10.759 9.559 8.065 7.075 9.02 M1.5V 228 1
31 HD 131977 BY* 14 57 28.0008928545 -21 24 55.726897561 7.89 6.83 5.72 4.74 4.19 K4V 454 0
32 2MASSW J1507476-162738 BD* 15 07 47.6756748763 -16 27 40.118410414     22.136 18.928 16.579 L5V 176 0
33 2MASS J15530228+1532369 BD* 15 53 02.28072 +15 32 36.9132           T6.5+T7.5 41 0
34 NAME UScoCTIO 108B BD? 16 05 54.09504 -18 18 48.8592           ~ 46 0
35 RX J1609.5-2105B LM* 16 09 30.377 -21 04 56.97           ~ 101 0
36 WISE J161705.74+180714.1 BD* 16 17 05.74008 +18 07 14.1996           T8 15 0
37 SDSS J175805.46+463311.9 BD* 17 58 05.45496 +46 33 09.9108           T7 36 0
38 WISE J181210.85+272144.3 BD* 18 12 10.85064 +27 21 44.3520           T8.5: 11 0
39 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2549 0
40 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 298 0
41 HD 182488B BD* 19 23 34.0126 +33 13 19.078           T9 58 0
42 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 109 0
43 Wolf 940 B BD* 21 46 38.829 -00 10 38.59           T8+/Y? 53 0
44 CFBDS J214947-040308 BD* 21 49 47.20 -04 03 08.9           T7 27 0
45 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 966 0
46 HD 218396e Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 149 1
47 HD 218396d Pl 23 07 28.7156905667 +21 08 03.302133882           ~ 193 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2017A&A...603A..57S and select 'bookmark this link' or equivalent in the popup menu


2021.07.27-00:03:21

© Université de Strasbourg/CNRS

    • Contact