2017A&A...600A.138C


Query : 2017A&A...600A.138C

2017A&A...600A.138C - Astronomy and Astrophysics, volume 600A, 138-138 (2017/4-1)

The GTC exoplanet transit spectroscopy survey. V. A spectrally-resolved Rayleigh scattering slope in GJ 3470b.

CHEN G., GUENTHER E.W., PALLE E., NORTMANN L., NOWAK G., KUNZ S., PARVIAINEN H. and MURGAS F.

Abstract (from CDS):

Aims. As a sub-Uranus-mass low-density planet, GJ 3470b has been found to show a flat featureless transmission spectrum in the infrared and a tentative Rayleigh scattering slope in the optical. We conducted an optical transmission spectroscopy project to assess the impacts of stellar activity and to determine whether or not GJ 3470b hosts a hydrogen-rich gas envelop.
Methods. We observed three transits with the low-resolution Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at the 10.4m Gran Telescopio Canarias, and one transit with the high-resolution Ultraviolet and Visual Echelle Spectrograph (UVES) at the 8.2m Very Large Telescope.
Results. From the high-resolution data, we find that the difference of the CaII H+K lines in- and out-of-transit is only 0.67±0.22%, and determine a magnetic filling factor of about 10-15%. From the low-resolution data, we present the first optical transmission spectrum in the 435-755nm band, which shows a slope consistent with Rayleigh scattering.
Conclusions. After exploring the potential impacts of stellar activity in our observations, we confirm that Rayleigh scattering in an extended hydrogen-helium atmosphere is currently the best explanation. Further high-precision observations that simultaneously cover optical and infrared bands are required to answer whether or not clouds and hazes exist at high-altitude.

Abstract Copyright: © ESO, 2017

Journal keyword(s): planetary systems - planets and satellites: individual: GJ 3470b - planets and satellites: atmospheres - techniques: spectroscopic - techniques: spectroscopic

CDS comments: Paragraph 4.1 : V105 Or not identified, probable misprint.

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* V371 Ori Er* 05 33 44.8000263360 +01 56 43.452872340 13.956 12.51 11.499 10.382 9.072 M3.0Ve 148 0
2 LP 424-4 PM* 07 59 05.8395356736 +15 23 29.236065000   13.5   11.934   M2.0V 104 1
3 NAME LP 424-4b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 259 1
4 TYC 1363-2087-1 * 07 59 13.1583880464 +15 25 47.869649904   11.34 10.33     ~ 3 0
5 * rho01 Cnc e Pl 08 52 35.8113282132 +28 19 50.956901366           ~ 519 1
6 HD 97658b Pl 11 14 33.1613362847 +25 42 37.391912066           ~ 185 1
7 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 739 1
8 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 653 1
9 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 376 1
10 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1323 1
11 TRAPPIST-1b Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 197 0
12 TRAPPIST-1c Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 149 0

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