| Record |
| Author |
Weaver, I.C.; Lopez-Morales, M.; Espinoza, N.; Rackham, B.V.; Osip, D.J.; Apai, D.; Jordan, A.; Bixel, A.; Lewis, N.K.; Alam, M.K.; Kirk, J.; McGruder, C.; Rodler, F.; Fienco, J. |
| Title |
ACCESS: A Visual to Near-infrared Spectrum of the Hot Jupiter WASP-43b with Evidence of H2O, but No Evidence of Na or K |
Type |
|
| Year |
2020 |
Publication |
Astronomical Journal |
Abbreviated Journal |
Astron. J. |
Volume  |
159 |
Issue |
1 |
Pages |
21 pp |
| Keywords |
|
| Abstract |
We present a new ground-based visual transmission spectrum of the hot Jupiter WASP-43b, obtained as part of the ACCESS Survey. The spectrum was derived from four transits observed between 2015 and 2018, with combined wavelength coverage between 5300 and 9000 A and an average photometric precision of 708 ppm in 230 A bins. We perform an atmospheric retrieval of our transmission spectrum combined with literature Hubble Space Telescope/WFC3 observations to search for the presence of clouds/hazes as well as Na, K, H alpha, and H2O planetary absorption and stellar spot contamination over a combined spectral range of 5318-16420 A. We do not detect a statistically significant presence of Na i or K i alkali lines, or H alpha in the atmosphere of WASP-43b. We find that the observed transmission spectrum can be best explained by a combination of heterogeneities on the photosphere of the host star and a clear planetary atmosphere with H2O. This model yields a log evidence of 8.26 0.42 higher than a flat (featureless) spectrum. In particular, the observations marginally favor the presence of large, low-contrast spots over the four ACCESS transit epochs with an average covering fraction T = 132 K 132 K. Within the planet's atmosphere, we recover a log H2O volume mixing ratio of -2.78(-1.47)(+1.38), which is consistent with previous H2O abundance determinations for this planet. |
| Address |
[Weaver, Ian C.; Lopez-Morales, Mercedes; Alam, Munazza K.; Kirk, James; McGruder, Chima] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA, Email: iweaver@cfa.harvard.edu |
| Corporate Author |
|
Thesis |
|
| Publisher |
Iop Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
English |
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0004-6256 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
WOS:000519136000001 |
Approved |
|
| Call Number |
UAI @ eduardo.moreno @ |
Serial |
1168 |
| Permanent link to this record |
