Hα Variability in PTFO 8-8695 and the possible direct detection of emission from a 2 million year old evaporating hot Jupiter

Johns-Krull, Christopher M. and Prato, Lisa and McLane, Jacob N. and Ciardi, David R. and van Eyken, Julian C. and Chen, Wei and Stauffer, John R. and Beichman, Charles A. and Frazier, Sarah A. and Boden, Andrew F. and Morales-Calderon, Maria and Rebull, Luisa M. (2016) Hα Variability in PTFO 8-8695 and the possible direct detection of emission from a 2 million year old evaporating hot Jupiter. The Astrophysical Journal, 830 (1). pp. 14-28. ISSN 0004-637X

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Abstract

We use high time cadence, high spectral resolution optical observations to detect excess Hα emission from the 2-3 Myr old weak-lined T Tauri star PTFO 8-8695. This excess emission appears to move in velocity as expected if it were produced by the suspected planetary companion to this young star. The excess emission is not always present, but when it is, the predicted velocity motion is often observed. We have considered the possibility that the observed excess emission is produced by stellar activity (flares), accretion from a disk, or a planetary companion; we find the planetary companion to be the most likely explanation. If this is the case, the strength of the Hα line indicates that the emission comes from an extended volume around the planet, likely fed by mass loss from the planet which is expected to be overflowing its Roche lobe.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 31 May 2017 02:06
Last Modified: 27 Jun 2017 00:18
Uncontrolled Keywords: accretion, accretion disks; line: profiles; stars: atmospheres; stars: formation; stars: magnetic field; stars: pre-main sequence;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/0004-637X/830/1/15
URI: http://eprints.usq.edu.au/id/eprint/32087

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