2019MNRAS.482.2065E


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST07:03:02

2019MNRAS.482.2065E - Mon. Not. R. Astron. Soc., 482, 2065-2087 (2019/January-2)

ACCESS: a featureless optical transmission spectrum for WASP-19b from Magellan/IMACS.

ESPINOZA N., RACKHAM B.V., JORDAN A., APAI D., LOPEZ-MORALES M., OSIP D.J., GRIMM S.L., HOEIJMAKERS J., WILSON P.A., BIXEL A., McGRUDER C., RODLER F., WEAVER I., LEWIS N.K., FORTNEY J.J. and FRAINE J.

Abstract (from CDS):

The short-period (0.94-d) transiting exoplanet WASP-19b is an exceptional target for transmission spectroscopy studies, due to its relatively large atmospheric scale height (∼500 km) and equilibrium temperature (∼2100 K). Here, we report on six precise spectroscopic Magellan/IMACS observations, five of which target the full optical window from 0.45µm and one targeting the 0.4-0.55 µm blue-optical range. Five of these data sets are consistent with a transmission spectrum without any significant spectral features, while one shows a significant slope as a function of wavelength, which we interpret as arising from photospheric heterogeneities in the star. Coupled with HST/WFC3 infrared observations, our optical/near-infrared measurements point to the presence of high altitude clouds in WASP-19b's atmosphere in agreement with previous studies. Using a semi-analytical retrieval approach, considering both planetary and stellar spectral features, we find a water abundance consistent with solar for WASP-19b and strong evidence for sub-solar abundances for optical absorbers such as TiO and Na; no strong optical slope is detected, which suggests that if hazes are present, they are much weaker than previously suggested. In addition, two spot-crossing events are observed in our data sets and analysed, including one of the first unambiguously detected bright-spot-crossing events on an exoplanet host star.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: spectroscopic - planets and satellites: atmospheres - planets and satellites: individual: WASP-19b - stars: activit - stars: individual: WASP-19 - starspots

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 - 2021
#notes
1 UCAC4 222-041059 * 09 52 44.7067682756 -45 40 27.334458631   14.22 13.68 13.56   ~ 1 0
2 UCAC4 223-043418 * 09 53 15.7358954409 -45 31 57.081314060   13.69 13.26 13.20   ~ 1 0
3 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 283 1
4 WASP-19 LP* 09 53 40.0764883458 -45 39 33.055979403   13.05 12.31 12.12 11.35 G8V 141 1
5 UCAC4 222-041449 * 09 53 54.4315091793 -45 40 01.806158205   13.87 13.40 13.34   ~ 1 0
6 TYC 8181-915-1 * 09 53 57.2799028226 -45 46 42.438166902   12.06 12.05     ~ 1 0
7 TYC 8181-2752-1 * 09 54 06.9856078888 -45 44 27.477998035   12.22 11.62     ~ 1 0
8 2MASS J09543557-4537090 LP* 09 54 35.5780250781 -45 37 08.999413244   14.44 12.784 12.34 10.69 ~ 3 0
9 TYC 8181-2824-1 * 09 54 59.0561714331 -45 44 37.173208577   11.356 10.444 10.236   ~ 1 0
10 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 573 1
11 WASP-6b Pl 23 12 37.7368657624 -22 40 26.277489164           ~ 106 1
12 WASP-52 * 23 13 58.7575814237 +08 45 40.571306719   12.9 12.0 12.03   K2V 50 1

    Equat.    Gal    SGal    Ecl

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2021.05.09-07:03:02

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