Rare Exoplanet Transits Observed from Antarctica

Of the 870+ southern planetary candidates from TESS currently awaiting confirmation, roughly 10% have transit durations longer than five hours; over a third of these also have orbital periods longer than 20 days. Systems like these could fall into the sparsely populated parameter space of long-perio...

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Bibliographic Details
Main Authors: Dransfield, Georgina, Triaud, Amaury H. M. J., Guillot, Tristan, Abe, Lyu, Mekarnia, Djamel, Crouzet, Nicolas, Suarez, Olga, Schmider, François-Xavier, Agabi, Karim
Format: Conference Object
Language:unknown
Published: 2021
Subjects:
Exoplanets
Transit photometry
Antarctica
TESS
Long period
Warm Neptune
TTV
Warm Jupiter
Austral
Jupiter
South Pole
Antarc*
South pole
Online Access:https://zenodo.org/record/5129291
https://doi.org/10.5281/zenodo.5129291
Description
Summary:Of the 870+ southern planetary candidates from TESS currently awaiting confirmation, roughly 10% have transit durations longer than five hours; over a third of these also have orbital periods longer than 20 days. Systems like these could fall into the sparsely populated parameter space of long-period gas giants; but long transits that happen infrequently present an observational challenge from the ground. Not so for ASTEP, a 40cm telescope installed at Dome C in Antarctica. ASTEP’s proximity to the South Pole means that it enjoys outstanding photometric conditions, as well exceptional phase coverage due to uninterrupted observing during the Austral Winter. In this poster I will share some results from ASTEP’s first seasons of SG1 observing, including uninterrupted 10 hour-long transits, TTV monitoring, and the first ever ground-based transit of a circumbinary planet.

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