The TESS-Keck Survey. XVII. Precise Mass Measurements in a Young, High-multiplicity Transiting Planet System Using Radial Velocities and Transit Timing Variations
Journal article, 2024
We present a radial velocity (RV) analysis of TOI-1136, a bright Transiting Exoplanet Survey Satellite (TESS) system with six confirmed transiting planets, and a seventh single-transiting planet candidate. All planets in the system are amenable to transmission spectroscopy, making TOI-1136 one of the best targets for intra-system comparison of exoplanet atmospheres. TOI-1136 is young (similar to 700 Myr), and the system exhibits transit timing variations (TTVs). The youth of the system contributes to high stellar variability on the order of 50 m s-1, much larger than the likely RV amplitude of any of the transiting exoplanets. Utilizing 359 High Resolution Echelle Spectrometer and Automated Planet Finder RVs collected as part of the TESS-Keck Survey, and 51 High-Accuracy Radial velocity Planetary Searcher North RVs, we experiment with a joint TTV-RV fit. With seven possible transiting planets, TTVs, more than 400 RVs, and a stellar activity model, we posit that we may be presenting the most complex mass recovery of an exoplanet system in the literature to date. By combining TTVs and RVs, we minimized Gaussian process overfitting and retrieved new masses for this system: (m b-g = 3.50-0.7+0.8 , 6.32-1.3+1.1 , 8.35-1.6+1.8 , 6.07-1.01+1.09 , 9.7-3.7+3.9 , 5.6-3.2+4.1 M circle plus). We are unable to significantly detect the mass of the seventh planet candidate in the RVs, but we are able to loosely constrain a possible orbital period near 80 days. Future TESS observations might confirm the existence of a seventh planet in the system, better constrain the masses and orbital properties of the known exoplanets, and generally shine light on this scientifically interesting system.
Author
Corey Beard
University of California at Irvine (UCI)
Paul Robertson
University of California at Irvine (UCI)
Fei Dai
California Institute of Technology (Caltech)
CALTECH, Div Geol & Planetary Sci, 1200 E Calif Blvd
Rae Holcomb
University of California at Irvine (UCI)
Jack Lubin
University of California at Irvine (UCI)
Joseph M. Akana Murphy
University of California at Santa Cruz
Natalie M. Batalha
University of California at Santa Cruz
Sarah Blunt
California Institute of Technology (Caltech)
Ian Crossfield
Univ Kansas
Courtney Dressing
University of California at Berkeley
Benjamin Fulton
Exoplanet Sci Inst, NASA, Caltech, IPAC, MC 314-6, 1200 Calif Blvd
Andrew W. Howard
California Institute of Technology (Caltech)
Dan Huber
University of Hawaii
Howard Isaacson
University of California at Berkeley
University of Southern Queensland
Stephen R. Kane
Univ Calif Riverside
Grzegorz Nowak
Nicolaus Copernicus University
University of La Laguna
Instituto de Astrofísica de Canarias
Erik A. Petigura
Univ Calif Angeles, Dept Phys & Astron
Arpita Roy
Johns Hopkins University
Space Telescope Science Institute (STScI)
Ryan A. Rubenzahl
California Institute of Technology (Caltech)
Lauren M. Weiss
University of Notre Dame
Rafael Barrena
Instituto de Astrofísica de Canarias
University of La Laguna
Aida Behmard
CALTECH, Div Geol & Planetary Sci, 1200 E Calif Blvd
Casey L. Brinkman
University of Hawaii
Ilaria Carleo
University of La Laguna
Instituto de Astrofísica de Canarias
Ashley Chontos
University of Hawaii
Princeton University
Paul A. Dalba
University of California at Santa Cruz
NASA Ames Research Center
Tara Fetherolf
Univ Calif Riverside
Steven Giacalone
University of California at Berkeley
Michelle L. Hill
Univ Calif Riverside
Kiyoe Kawauchi
Ritsumeikan University
Judith Korth
Lund University
Rafael Luque
Univ Chicago, Pediat
Mason G. Macdougall
Univ Calif Angeles, Dept Phys & Astron
Andrew W. Mayo
University of California at Berkeley
Teo Mocnik
Gemini Observ, NSFs NOIRLab
Giuseppe Morello
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Felipe Murgas
University of La Laguna
Instituto de Astrofísica de Canarias
Jaume Orell-Miquel
Instituto de Astrofísica de Canarias
Enric Palle
Instituto de Astrofísica de Canarias
University of La Laguna
Alex S. Polanski
University of Kansas
Malena Rice
Massachusetts Institute of Technology (MIT)
Yale University
Nicholas Scarsdale
University of California at Santa Cruz
Dakotah Tyler
Univ Calif Angeles, Dept Phys & Astron
Judah Van Zandt
Univ Calif Angeles, Dept Phys & Astron
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 167 2 70Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.3847/1538-3881/ad1330