The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-mass Outer Companion around TOI-1272
Astronomical Journal, ISSN: 0004-6256, Vol: 164, Issue: 3
2022
- 2Citations
- 8Captures
- 5Mentions
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Article Description
We report the discovery of an eccentric hot Neptune and a non-transiting outer planet around TOI-1272. We identified the eccentricity of the inner planet, with an orbital period of 3.3 days and R = 4.1 ± 0.2 R , based on a mismatch between the observed transit duration and the expected duration for a circular orbit. Using ground-based radial velocity (RV) measurements from the HIRES instrument at the Keck Observatory, we measured the mass of TOI-1272b to be M = 25 ± 2 M . We also confirmed a high eccentricity of e = 0.34 ± 0.06, placing TOI-1272b among the most eccentric well-characterized sub-Jovians. We used these RV measurements to also identify a non-transiting outer companion on an 8.7 day orbit with a similar mass of M sin i = 27 ± 3 M and e ≲ 0.35. Dynamically stable planet-planet interactions have likely allowed TOI-1272b to avoid tidal eccentricity decay despite the short circularization timescale expected for a close-in eccentric Neptune. TOI-1272b also maintains an envelope mass fraction of f ≈ 11% despite its high equilibrium temperature, implying that it may currently be undergoing photoevaporation. This planet joins a small population of short-period Neptune-like planets within the “Hot Neptune Desert” with a poorly understood formation pathway.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85135983379&origin=inward; http://dx.doi.org/10.3847/1538-3881/ac7ce1; https://iopscience.iop.org/article/10.3847/1538-3881/ac7ce1; https://dx.doi.org/10.3847/1538-3881/ac7ce1; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=7ce68f32-c4bb-4815-916b-784dc9079b75&ssb=58886299035&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.3847%2F1538-3881%2Fac7ce1&ssi=44bbdd59-8427-4b9b-86be-64f9ee3c123f&ssk=support@shieldsquare.com&ssm=0938418767896310734638747094301165&ssn=7dcdc9036243fc04d956aed09e70bf1eceb07e0cefdd-4cfc-4bbb-8692a8&sso=783c4d02-43021bd394888c654407c4a8ac3c748c4031965a14c017d5&ssp=13291653921714206127171444390692913&ssq=28607110272676774962058034883121978975679&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJ1em14IjoiN2Y5MDAwNGZmYWY2NjctOTQ1MC00Mzg2LThmY2YtZDRjOTdmMmYzZTkzMy0xNzE0MjU4MDM0Mjg0MTQ0NjkxNzUzLTY3ZmY1MGU1MjgxYjFjNGMzNDYzIiwicmQiOiJpb3Aub3JnIiwiX191em1mIjoiN2Y2MDAwMTU1Y2E4MDAtZmVmYS00M2E2LTgyMWQtYWQwMzhiMzEwNmE4MTcxNDI1ODAzNDI4NDE0NDY5MTc1My03NjgwNWQyYmU5N2JlNTk3MzQ2MyJ9
American Astronomical Society
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