The orbit of Beta Pic b as a transiting planet
A. Lecavelier des Etangs, A. Vidal-Madjar

TL;DR
This paper investigates the orbit of Beta Pic b, proposing it as the transiting planet responsible for the 1981 photometric event, and identifies two possible orbital solutions consistent with existing observations.
Contribution
It presents two potential orbital configurations for Beta Pic b that align with all current measurements, aiding future transit predictions.
Findings
Two compatible orbital solutions with periods of ~18 and ~36 years.
Predicted next transits could occur as early as 2017 or 2018.
Future imaging can distinguish between the proposed orbits.
Abstract
In 1981, Beta Pictoris showed strong and rapid photometric variations possibly due to a transiting giant planet. Later, a planetary mass companion to the star, Beta Pic b, was identified using imagery. Observations at different epochs (2003 and 2009-2015) detected the planet at a projected distance of 6 to 9 AU from the star and showed that the planet is on an edge-on orbit. The observed motion is consistent with an inferior conjunction in 1981, and Beta Pic b can be the transiting planet proposed to explain the photometric event observed at that time. Assuming that the 1981 event is related to the transit or the inferior conjunction of Beta Pic b on an edge-on orbit, we search for the planetary orbit in agreement with all the measurements of the planet position published so far. We find two different orbits that are compatible with all these constraints: (i) an orbit with a period of…
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