TOI-1338: TESS’ First Transiting Circumbinary Planet

Kostov, Veselin B.; Orosz, Jerome A.; Feinstein, Adina D.; Welsh, William F.; Cukier, Wolf; Haghighipour, Nader; Quarles, Billy; Martin, David V.; Montet, Benjamin T.; Torres, Guillermo; Triaud, A. H. M. J.; Barclay, Thomas; Boyd, Patricia T.; Briceño, César; Cameron, A. Collier; Correia, A. C. M.; Gilbert, Emily A.; Gill, Samuel; Gillon, M.; Haqq-Misra, Jacob; Hellier, C.; Dressing, Courtney D.; Fabrycky, Daniel C.; Fürész, Gábor; Jenkins, Jon M.; Kane, Stephen R.; Kopparapu, R.; Kunovac, Vedad; Latham, David W.; Law, Nicholas M.; Levine, Alan M.; Li, Gongjie; Lintott, Chris; Lissauer, Jack J.; Mann, Andrew W.; Mazeh, T.; Mardling, Rosemary A.; Maxted, P. F. L.; Eisner, Nora L.; Pepe, F.; Pepper, Joshua; Pollacco, D.; Quinn, Samuel N.; Quintana, Elisa V.; Rowe, Jason F.; Ricker, G.; Rose, Mark; Seager, Sara; Santerne, A.; Ségransan, D.; Short, Donald R.; Smith, Jeffrey C.; Standing, Matthew R.; Tokovinin, Andreï; Trifonov, T.; Turner, O. D.; Twicken, Joseph D.; Udry, S.; Vanderspek, R.; Winn, Joshua N.; Wolf, Eric T.; Ziegler, Carl; Ansorge, Peter; Barnet, Frank; Bergeron, Joel; Huten, Marc; Pappa, G.; Straeten, Timo van der

doi:10.3847/1538-3881/ab8a48

Cited by 85 publications

(69 citation statements)

References 94 publications

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“…Ordinarily, an independent measurement of the rotation period from spot modulation, together with a projected equatorial rotational velocity from the Rossiter-McLaughlin analysis, can provide a measurement of the stellar inclination. However, Kostov et al (2020) show that neither TESS nor ASAS-SN photometry display any clear periodicity. We show our fit to the differential rotation model in the right-hand panel of Fig.…”

Section: Differential Rotation and True Obliquitymentioning

confidence: 68%

“…An additional 17 CORALIE measurements were made and published in , and an additional seven HARPS measurements have been taken since. Finally, J0608-59 was observed in 12 TESS sectors (Kostov et al 2020), 9 of which were short-cadence data under the Guest Investigator Program G011278 (PI: O. Turner). The BEBOP data were not used in the analysis of this work, but we use orbital parameters (Table 1) from Kostov et al (2020) that are based on the BEBOP and TESS data.…”

Section: O B S E Rvat I O N Smentioning

confidence: 99%

“…We start by removing the Keplerian velocity due to the binary orbit by resampling the CCFs on a common velocity grid at the spectrograph resolution of ∼1.8 km s −1 . The orbital parameters to compute the Keplerian model are obtained from Kostov et al (2020), who analysed the full TESS Cycle 1 photometry and CORALIE/HARPS radial velocities, modelling both the binary orbit as well as the circumbinary planet orbit using a photodynamical model. Their fit did not detect any significant binary apsidal motion, and produced a χ 2 ν ≈ 1, indicating very good agreement on the data despite that ∼10 yr separating the first CORALIE observations from the TESS photometry.…”

Section: Retrieving the Occulted Lightmentioning

confidence: 99%

“…In the same fashion, we also estimate the CCF error by computing the standard deviation of the continuum flux. Furthermore, we also normalize the CCFs by the theoretical primary eclipse limb-darkened light curve to account for the loss of light during eclipse, where the light curve was again computed using orbital elements from Kostov et al (2020).…”

Section: Retrieving the Occulted Lightmentioning

confidence: 99%

“…Given that the binary and planet orbits are co-planar, with mutual a inclination | i| = 0.3 • , the largest angular momentum vectors are thus found to be aligned. Kostov et al (2020) reported v eq sin i ,1 = 3.6 + −0.6 km s −1 from rotational broadening, based on high-resolution spectra from HARPS obtained through the BEBOP survey (ESO prog. ID 1101.C-0721, PI: Triaud; Martin et al 2019), thus the two measurements agree very well.…”

Section: Stellar Obliquity and Rotationmentioning

confidence: 99%

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The EBLM project – VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A

Kunovac

Triaud

Martin

et al. 2020

Monthly Notices of the Royal Astronomical Society

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A dozen short-period detached binaries are known to host transiting circumbinary planets. In all circumbinary systems so far, the planetary and binary orbits are aligned within a couple of degrees. However, the obliquity of the primary star, which is an important tracer of their formation, evolution, and tidal history, has only been measured in one circumbinary system until now. EBLM J0608-59/TOI-1338 is a low-mass eclipsing binary system with a recently discovered circumbinary planet identified by TESS. Here, we perform high-resolution spectroscopy during primary eclipse to measure the projected stellar obliquity of the primary component. The obliquity is low, and thus the primary star is aligned with the binary and planetary orbits with a projected spin–orbit angle β = 2○.8 ± 17○.1. The rotation period of 18.1 ± 1.6 d implied by our measurement of vsin i⋆ suggests that the primary has not yet pseudo-synchronized with the binary orbit, but is consistent with gyrochronology and weak tidal interaction with the binary companion. Our result, combined with the known coplanarity of the binary and planet orbits, is suggestive of formation from a single disc. Finally, we considered whether the spectrum of the faint secondary star could affect our measurements. We show through simulations that the effect is negligible for our system, but can lead to strong biases in vsin i⋆ and β for higher flux ratios. We encourage future studies in eclipse spectroscopy test the assumption of a dark secondary for flux ratios ≳1ppt.

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Section: Differential Rotation and True Obliquitymentioning

confidence: 68%

Section: O B S E Rvat I O N Smentioning

confidence: 99%

Section: Retrieving the Occulted Lightmentioning

confidence: 99%

Section: Retrieving the Occulted Lightmentioning

confidence: 99%

Section: Stellar Obliquity and Rotationmentioning

confidence: 99%

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The EBLM project – VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A

Kunovac

Triaud

Martin

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Stable climates for temperate rocky circumbinary planets

Komacek

2020

Preprint

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Stories of life on planets with multiple host stars have made for compelling science fiction, from Tatooine to Trisolaris. However, searching for Earth-sized planets orbiting multiple host stars is also compelling from a practical perspective, as about half of stars surveyed are part of multiple star systems (Raghavan et al., 2010). In recent years, the Kepler and Transiting Exoplanet Survey Satellite (TESS) missions have found a range of circumbinary planets that orbit exterior to binary star systems (e.g.,

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Detection of separatrices and chaotic seas based on orbit amplitudes

Daquin

Charalambous

2023

Celest Mech Dyn Astron

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TOI-1338: TESS’ First Transiting Circumbinary Planet

Cited by 85 publications

References 94 publications

The EBLM project – VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A

The EBLM project – VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A

Stable climates for temperate rocky circumbinary planets

Detection of separatrices and chaotic seas based on orbit amplitudes

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