Limits on eclipses of the pre-main-sequence star KH 15D in the first half of the 20th century

Details Limits on eclipses of the pre-main-sequence star KH 15D in the first half of the 20th century Limits on eclipses of the pre-main-sequence star KH 15D in the first half of the 20th century

2003-06-25

arxiv.org/abs/astro-ph/0306539v1

Astrophys.J.593:L121-L124,2003

Astronomy and Astrophysics

Astrophysics

ApJ Letters, in press [10pp, 4 figs]

Scientific paper

10.1086/378314

Over the last decade, the pre-main sequence star KH 15D has exhibited periodic eclipses that are surprisingly deep (~3 mag) and long-lasting (~40% of the 48.4-day period). The cause of the eclipses is unknown, but it could be a feature in a nearly edge-on protoplanetary disk. Here we report on an analysis of archival photographs of KH 15D from the Harvard College Observatory plate collection, most of which were taken during the years 1913-1951. During this time range, the data are consistent with no eclipses; the duty cycle of 1 mag eclipses was less than 20%. The decadal timescale of this change in eclipse behavior is compatible with the expected timescale of protoplanet/disk interactions. Archival images from more recent epochs should reveal the onset of the eclipses.

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