A Search for Jovian Planets around Hot White Dwarfs | Zendy

YouHua Chu | Zendy; B. C. Dunne | Zendy; R. A. Gruendl | Zendy; W. Brandner | Zendy

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A Search for Jovian Planets around Hot White Dwarfs

Author(s) -

YouHua Chu,

B. C. Dunne,

R. A. Gruendl,

W. Brandner

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/318058

Subject(s) - jovian , physics , white dwarf , planet , exoplanet , astronomy , gas giant , astrophysics , brown dwarf , planetary system , hot jupiter , solar system , stars , astrobiology , saturn

Current searches for extrasolar planets have concentrated on observing thereflex Doppler shift of solar-type stars. Little is known, however, aboutplanetary systems around non-solar-type stars. We suggest a new method toextend planetary searches to hot white dwarfs. Near a hot white dwarf, theatmosphere of a Jovian planet will be photoionized and emit hydrogenrecombination lines, which may be detected by high- dispersion spectroscopicobservations. Multi-epoch monitoring can be used to distinguish between non-LTEstellar emission and planetary emission, and to establish the orbitalparameters of the detected planets. In the future, high-precision astrometricmeasurements of the hot white dwarf will allow the masses of the detectedplanets to be determined. Searches for Jovian planets around hot white dwarfswill provide invaluable new insight on the development of planetary systemsaround stars more massive than the Sun and on how stellar evolution affectsthese systems. We present high-dispersion spectroscopic observations of thewhite dwarf Feige 34 to demonstrate the complexity and feasibility of thesearch method.Comment: 10 pages, 2 figures, accepted for publication in the ApJ Letter

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