Dust around the Planet-bearing M Star Gliese 436

Details Dust around the Planet-bearing M Star Gliese 436 Dust around the Planet-bearing M Star Gliese 436

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..229b&link_type=abstract

Spitzer Proposal ID #229

Computer Science

Scientific paper

As Spitzer investigators with a direct interest in the search for debris disks around stars with planets based on our approved GO-1 program on Comparative Planetology, we would like to request 1.3 hr of Director's Discretionary time to observe Gliese 436. This M2.5 star is located just 10 pc away, and, as was just announced (Marcey et al. 2004), has a Uranus/Neptune mass planet orbiting it with a 3 day period. GJ436 will quickly become a critical star for future planet searches. Because of its proximity and low stellar mass, an Earth-mass planet orbiting GJ436 at 1 AU would be detectable by SIM. Spitzer will detect or set strong limits on a dust cloud (Kuiper or asteroid belt) associated with this star/planet system. Since the similarly nearby M star AU Mic has recently been found to have a prominent disk using coronagraphy (and Spitzer observations are planned), it would be of great interest to determine whether GJ436, only the second M star known to have a planet, also has an associated debris disk. Spitzer GTO data show that between 10-25% of mature (>3Gyr) F5-K5 stars with planets have prominent excesses at 70um (Beichman et al, in prep 2004), so there is a reasonable prospect of success even if this star is old. GJ436 is not in any GO or GTO program that we can identify.

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