Detection of sodium absorption in WASP-17b with Magellan

Zhou, G. ORCID: and Bayliss, D. D. R. (2012) Detection of sodium absorption in WASP-17b with Magellan. Monthly Notices of the Royal Astronomical Society, 426 (3). pp. 2483-2488. ISSN 0035-8711

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We present the detection of sodium absorption in the atmosphere of the extrasolar planet WASP-17b, an inflated hot Jupiter in a tight orbit around an F6 dwarf. In-transit observations of WASP-17 made with the Magellan Inamori Kyocera Echelle (MIKE) spectrograph on the 6.5-m Magellan Telescope were analysed for excess planetary atmospheric absorption in the Nai D doublet spectral region. Using the interstellar sodium absorption lines as reference, we detect a 0.58 +/- 0.13 per cent transit signal, with 4.5s confidence, at 1.5 angstrom bandwidth around the stellar sodium absorption feature. This result is consistent with the previous Very Large Telescope detection of sodium in WASP-17b, confirming that the planet has a highly inflated atmosphere.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 11 Jan 2022 00:46
Last Modified: 11 Jan 2022 06:06
Uncontrolled Keywords: methods: observational; techniques: spectroscopic; planets and; satellites: atmospheres; planets and satellites: individual: WASP-17b; stars: individual: WASP-17; planetary systems; Astrophysics - Earth and; Planetary Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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