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25 April 2024 |
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The Young Planet DS Tuc Ab has a Low Obliquity | | Benjamin T. Montet
; Adina D. Feinstein
; Rodrigo Luger
; Megan E. Bedell
; Michael A. Gully-Santiago
; Johanna K. Teske
; Sharon Xuesong Wang
; R. Paul Butler
; Erin Flowers
; Stephen A. Shectman
; Jeffrey D. Crane
; Ian B. Thompson
; | | Date: |
9 Dec 2019 | | Abstract: | The abundance of short-period planetary systems with high obliquities is
often taken as evidence that scattering processes play important roles in the
formation and evolution of these systems. More recent studies have suggested
that wide binary companions can tilt protoplanetary disks, inducing a high
obliquity on planets that form through smooth processes like disk migration. DS
Tuc Ab, a transiting planet with an an 8.138 day period in the 40 Myr
Tucana-Horologium association, likely orbits in the same plane as its
now-dissipated protoplanetary disk, enabling us to test these theories of disk
physics. Here, we report on Rossiter-McLaughlin observations of one transit of
DS Tuc Ab with the Planet Finder Spectrograph on the Magellan Clay Telescope at
Las Campanas Observatory. We confirm the previously detected planet by modeling
the planet transit and stellar activity signals simultaneously. We test
multiple models to describe the stellar activity-induced RV variations over the
night of the transit, finding the planet’s projected obliquity to be low: $psi
= 12 pm 13$ degrees, suggesting that this planet likely formed through smooth
disk processes and its protoplanetary disk was not significantly torqued by DS
Tuc B. This is the youngest planet to be observed using this technique; we
provide a discussion on best practices to accurately measure the observed
signal of similar young planets. | | Source: | arXiv, 1912.3794 | | Services: | Forum | Review | PDF | Favorites | |
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