Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1011.3455)
· On-line Data
· References in the article
· Citations to the Article (45) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (21)
· Associated Articles
· Also-Read Articles (Reads History)
· Translate This Page
Prospects for detection of exoplanet magnetic fields through bow-shock observations during transits
Vidotto, A. A.; Jardine, M.; Helling, Ch.
AA(SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS), AB(SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS), AC(SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS)
Monthly Notices of the Royal Astronomical Society: Letters, Volume 411, Issue 1, pp. L46-L50. (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
planets and satellites: magnetic fields, stars: coronae, stars: winds, outflows
Abstract Copyright:
2010 The Authors Monthly Notices of the Royal Astronomical Society 2010 RAS
Bibliographic Code:


An asymmetry between the ingress and egress times was observed in the near-UV light curve of the transit planet WASP-12b. Such asymmetry led us to suggest that the early ingress in the UV light curve of WASP-12b, compared to the optical observations, is caused by a shock around the planet, and that shocks should be a common feature in transiting systems. Here, we classify all the transiting systems known to date according to their potential for producing shocks that could cause observable light curve asymmetries. We found that 36/92 of known transiting systems would lie above a reasonable detection threshold and that the most promising candidates to present shocks are: WASP-19b, WASP-4b, WASP-18b, CoRoT-7b, HAT-P-7b, CoRoT-1b, TrES-3 and WASP-5b. For prograde planets orbiting outside the corotation radius of fast rotating stars, the shock position, instead of being ahead of the planetary motion as in WASP-12b, trails the planet. In this case, we predict that the light curve of the planet should present a late-egress asymmetry. We show that CoRoT-11b is a potential candidate to host such a behind shock and show a late egress. If observed, these asymmetries can provide constraints on planetary magnetic fields. For instance, for a planet that has a magnetic field intensity similar to Jupiter's field (˜14 G) orbiting a star whose magnetic field is between 1 and 100 G, the stand-off distance between the shock and the planet, which we take to be the size of the planet's magnetosphere, ranges from 1 to 40 planetary radii.

Associated Articles

Source Paper     Catalog Description    

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints