Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..986b&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.986
Astronomy and Astrophysics
Astronomy
Scientific paper
The giant planet :Pictoris B orbiting the southern star Pictoris was imaged several times since 2003 [6, 7, 5]. The number of astrometric data points of this planet relative to the star that we have allows a first tentative orbital determination. We made a least-square orbital fit as well as an exploration of the parameter space using a statistical bayesian MCMC (Markov Chain Monte-Carlo) method. We present here our preliminary results of orbital determination. We inverstigate the compatibility of the set of found solutions with preceding models involving the presence of a planet orbiting Pictoris : • The transit hypothesis: [8] and [9] reported a possible transit event due to a passing planet on Nov. 10, 1981. [10] claimed that Pictoris B could be that planet. We reinvestigate here this issue. • Falling Evaporating Bodies : Numerous transient spectral event in the absorption spectrum of Pictoris were attributed to evaporating stargrazing comets passing crossing the line of sight, called afterward Falling Evaporating Bodies ([1, 2] and refs. therein). This phenomenon was furthermore explained as resulting from bodies locked in mean-motion resonances with a Jovianlike planet with predicted parameters that fairly well match those of Pictoris B [3, 11, 4]. We discuss here in which way the orbital determination helps refining this issue. In any case, the astrometric follow-up of Pictoris B in the upcoming yearswill be of crucial interest to constrain all these models.
Beust Hervé
Chauvin Gael
Lagrange Anne Marie
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