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A search for planets transiting the M-dwarf debris disc host, AU Microscopii

Hebb, Leslie and Petro, Larry and Ford, Holland C. and Ardila, David R. and Toledo, Ignacio and Minniti, Dante and Golimowski, David A. and Clampin, Mark (2007) A search for planets transiting the M-dwarf debris disc host, AU Microscopii. Monthly Notices of the Royal Astronomical Society, 379 (1). pp. 63-72. ISSN 0035-8711.

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We present high-cadence, high-precision multiband photometry of the young, M1Ve, debris disc star, AU Microscopii. The data were obtained in three continuum filters spanning a wavelength range from 4500 to 6600 Å, plus Hα, over 28 nights in 2005. The light curves show intrinsic stellar variability due to star-spots with an amplitude in the blue band of 0.051 mag and a period of 4.847 d. In addition, three large flares were detected in the data which all occur near the minimum brightness of the star. We remove the intrinsic stellar variability and combine the light curves of all the filters in order to search for transits by possible planetary companions orbiting in the plane of the nearly edge-on debris disc. The combined final light curve has a sampling of 0.35 min and a standard deviation of 6.8 mmag. We performed Monte Carlo simulations by adding fake transits to the observed light curve and find with 95 per cent significance that there are no Jupiter mass planets orbiting in the plane of the debris disc on circular orbits with periods, P ≤ 5 d. In addition, there are no young Neptune like planets (with radii 2.5 times smaller than the young Jupiter) on circular orbits with periods, P ≤ 3 d.

Item Type:Article
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Hebb, Leslie0000-0003-1263-8637
Minniti, Dante0000-0002-7064-099X
Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 April 21. Received 2007 April 20; in original form 2007 February 21. DM and IT are partially supported by Fondap Centre for Astrophysics 15010003. This research was supported in part by NASA grant NAG5-7697. This paper has been typeset from a TEX/LATEX file prepared by the author.
Subject Keywords:circumstellar matter; stars: individual: AU Mic; stars: late-type; planetary systems; stars: pre-main-sequence
Issue or Number:1
Record Number:CaltechAUTHORS:HEBmnras07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9240
Deposited By: Tony Diaz
Deposited On:29 Nov 2007
Last Modified:21 Dec 2020 23:25

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