GJ 436 Extrasolar Planet Transit Campaign

Details GJ 436 Extrasolar Planet Transit Campaign GJ 436 Extrasolar Planet Transit Campaign

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aan...370....1p&link_type=abstract

AAVSO Alert Notice 370

Other

Gj 436, Extrasolar Planet, Transit, Mu.Ticolor Photometry, Aavso International Database

Scientific paper

A campaign, headed by Dr. Greg Laughlin (transitsearch.org and University of California, Santa Cruz) has been initiated to observe GJ 436 for transits of extrasolar planets. Precise multicolor photometry, carefully reduced but not transformed, is requested of AAVSO observers. The GJ 436 system is m(V)=~10.7; the expected transit length is ~1 hour; the transit depth is less than 0.1 magnitude (~0.006 mag). Dr. Laughlin provides the following transit period and ephemeris: P = 2.643901 days T_mid = 2454222.6157 HJD (02:46:36.48 UT May 2, 2007) The next transit is scheduled for February 14, 2008 from 06:49 to 07:47 UT. The parent system is very red (M3V); so including airmass values will be very important. Links to information on comparison stars, finder charts, airmass calculation, and other aspects of this campaign, as well as advice on making the photometric observations, is available in the Alert Notice. Observations submitted to the AAVSO International Database as GJ 436.

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