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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
  • 2
    Citations
  • 0
    Usage
  • 8
    Captures
  • 5
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    2
    • Citation Indexes
      2
  • Captures
    8
  • Mentions
    5
    • References
      5
      • Wikipedia
        5

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

Mason G. MacDougall; Erik A. Petigura; Tara Fetherolf; Corey Beard; Jack Lubin; Isabel Angelo; Natalie M. Batalha; Aida Behmard; Sarah Blunt; Casey Brinkman; Ashley Chontos; Ian J. M. Crossfield; Fei Dai; Paul A. Dalba; Courtney Dressing; Benjamin Fulton; Steven Giacalone; Michelle L. Hill; Andrew W. Howard; Daniel Huber; Howard Isaacson; Stephen R. Kane; Molly Kosiarek; Andrew Mayo; Teo Močnik; Joseph M. Akana Murphy; Daria Pidhorodetska; Alex Polanski; Malena Rice; Paul Robertson; Lee J. Rosenthal; Arpita Roy; Ryan A. Rubenzahl; Nicholas Scarsdale; Emma V. Turtelboom; Dakotah Tyler; Judah Van Zandt; Lauren M. Weiss; Emma Esparza-Borges; Akihiko Fukui; Keisuke Isogai; Kiyoe Kawauchi; Mayuko Mori; Felipe Murgas; Norio Narita; Taku Nishiumi; Enric Palle; Hannu Parviainen; Noriharu Watanabe; Jon M. Jenkins; David W. Latham; George R. Ricker; S. Seager; Roland K. Vanderspek; Joshua N. Winn; Allyson Bieryla; Douglas A. Caldwell; Diana Dragomir; M. M. Fausnaugh; Ismael Mireles; David R. Rodriguez

American Astronomical Society

Physics and Astronomy; Earth and Planetary Sciences

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