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23 April 2024 |
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TESS Observations of the Hot Jupiter Exoplanet XO-6b: No Evidence of Transit Timing Variations | | Andrew R. Ridden-Harper
; Jake D. Turner
; Ray Jayawardhana
; | | Date: |
22 Sep 2020 | | Abstract: | From previous ground-based observations, the hot Jupiter exoplanet XO-6b was
reported to exhibit apparently periodic transit timing variations (TTVs), with
a semi-amplitude of 14 minutes and a period of about 450 days. These variations
were interpreted as being due to a resonant perturbation between XO-6b and a
hitherto unknown low-mass planet orbiting the same star. To understand this
enigmatic planetary system better, we analysed three sectors of data, spanning
over seven months, from the Transiting Exoplanet Survey Satellite (TESS), which
produces high-quality light curves that are well suited to characterizing
exoplanets and searching for TTVs. Here we present an updated orbital period of
3.7649893 $pm$ 0.0000037 days and a transit epoch of 2456652.7157 $pm$ 0.0022
BJD$_{TDB}$. The planetary parameters we report, while consistent with their
discovery values, have greatly improved precision. Notably, we find no evidence
for TTVs: we can rule out TTVs $gtrsim$ 2.5 minutes at the 3$sigma$ level.
Therefore, the TESS data have sufficient precision and time baseline to reveal
readily the previously reported TTVs of approximately 10 minutes. Our findings
highlight TESS’s capabilities for robust follow-up, and confirm that TTVs are
rarely seen in hot Jupiters, unlike is the case with small planets. | | Source: | arXiv, 2009.10781 | | Services: | Forum | Review | PDF | Favorites | |
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