TOI-481 b and TOI-892 b: Two Long-period Hot Jupiters from the Transiting Exoplanet Survey Satellite

Brahm, R.; Nielsen, L. D.; Wittenmyer, Robert A.; Wang, Songhu; Rodriguez, Joseph E.; Espinoza, N.; Jones, M. I.; Jordán, Andrés; Henning, Thomas; Kossakowski, D.; Rojas, Felipe; Sarkis, P.; Schlecker, Martin; Trifonov, T.; Shahaf, Sahar; Ricker, G.; Vanderspek, R.; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Addison, Brett C.; Bakos, G. Á.; Bhatti, W.; Bayliss, Daniel; Berlind, P.; Bieryla, Allyson; Bouchy, F.; Bowler, Brendan P.; Brown, Timothy M.; Bryant, Edward M.; Caldwell, Douglas A.; Charbonneau, David; Collins, Karen A.; Davis, Allen B.; Esquerdo, Gilbert A.; Fulton, B. J.; Guerrero, Natalia; Henze, Christopher E.; Hogan, Aleisha; Horner, Jonathan; Huang, Chelsea X.; Irwin, Jonathan; Kane, Stephen R.; Kielkopf, John F.; Mann, Andrew W.; Mazeh, T.; McCormac, J.; McCully, C.; Mengel, M. W.; Mireles, Ismael; Okumura, Jack; Plavchan, Peter; Quinn, Samuel N.; Saesen, S.; Schlieder, Joshua E.; Ségransan, D.; Shiao, Bernie; Shporer, Avi; Siverd, Robert J.; Stassun, Keivan G.; Suc, V.; Tan, T. G.; Torres, Pascal; Tinney, C. G.; Udry, S.; Vanzi, L.; Vezie, Michael; Vines, José I.; Vučković, M.; Wright, D. E.; Yahalomi, Daniel A.; Zapata, A.; Zhang, Hui; Ziegler, Carl

doi:10.3847/1538-3881/abba3b

Cited by 30 publications

(20 citation statements)

References 104 publications

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“…Minerva-Australis is an array of four identical 0.7 m telescopes linked via fiber feeds to a single KiwiSpec echelle spectrograph at a spectral resolving power of R ≈ 80,000 over the wavelength region of 5000-6300 Å. The array is wholly dedicated to radial-velocity follow-up of TESS planet candidates (e.g., Nielsen et al 2019;Brahm et al 2020;Addison et al 2021). Simultaneous wavelength calibration is provided via two calibration fibers illuminated by a quartz lamp through an iodine cell.…”

Section: Spectroscopic Observationsmentioning

confidence: 99%

TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration

Dong

Huang

Zhou

et al. 2021

ApJL

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High-eccentricity tidal migration is a possible way for giant planets to be placed in short-period orbits. If this happens often, one would expect to catch proto hot Jupiters on highly elliptical orbits undergoing high-eccentricity tidal migration. As of yet, few such systems have been discovered. Here, we introduce TOI-3362b (TIC-464300749b), an 18.1 day, 5 M Jup planet orbiting a main-sequence F-type star that is likely undergoing higheccentricity tidal migration. The orbital eccentricity is 0.815 -+ 0.032 0.023 . With a semimajor axis of 0.153 -+ 0.003 0.002 au, the planet's orbit is expected to shrink to a final orbital radius of 0.051 -+ 0.006 0.008 au after complete tidal circularization. Several mechanisms could explain the extreme value of the planet's eccentricity, such as planet-planet scattering and secular interactions. Such hypotheses can be tested with follow-up observations of the system, e.g., measuring the stellar obliquity and searching for companions in the system with precise, long-term radial-velocity observations. The variation in the planet's equilibrium temperature as it orbits the host star and the tidal heating at periapse make this planet an intriguing target for atmospheric modeling and observation. Because the planet's orbital period of 18.1 days is near the limit of TESS's period sensitivity, even a few such discoveries suggest that proto hot Jupiters may be quite common.

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Section: Spectroscopic Observationsmentioning

confidence: 99%

TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration

Dong

Huang

Zhou

et al. 2021

ApJL

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“…This planet, moving on a circular orbit with a = 0.10 au about its subgiant host star, joins a small cohort of 56 confirmed planets orbiting within 0.5 au of evolved stars. With a period of nearly 10 days, this planet's orbital properties are similar to TOI-481b (Brahm et al 2020), another warm giant (T eq = 1210±29 K) orbiting a slightly evolved metal-rich star. While short-period giant planets orbiting stars more massive than the Sun remain rare, such planets appear to be preferentially found around super-Solar metallicity stars, as evidenced by the positive planet-metallicity correlation found for evolved stars by several studies (e.g.…”

Section: Discussionmentioning

confidence: 68%

TOI-1842b: A Transiting Warm Saturn Undergoing Re-Inflation around an Evolving Subgiant

Wittenmyer,

Clark,

Trifonov

et al. 2021

Preprint

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The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritise the thousands of transiting planet candidates for follow-up characterisation. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of 1.04 +0.06 −0.05 R J , a mass of 0.214 +0.040 −0.038 M J , an orbital period of 9.5739 +0.0002 −0.0001 days, and an extremely low density (ρ=0.252±0.091 g cm −3 ). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (J = 8.747 mag), making it an attractive target for atmospheric characterisation. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant reinflation. The primary transit duration of only 4.3 hours also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterisation.

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“…The very wide field of view of the NGTS telescopes gives them a unique capability amongst ground-based telescopes of being able to reach 150 ppm per 30 minutes for very bright stars (Bryant et al 2020). This has resulted in NGTS being used in the followup of bright stars, for example in refining the parameters for bright candidates from TESS (Armstrong et al 2020;Brahm et al 2020) and monitoring transit timing variations for bright stars (Bryant et al 2021).…”

Section: Photometry (Ngts)mentioning

confidence: 99%

Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory

O'Brien,

Bayliss,

Osborn

et al. 2021

Preprint

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Ground-based photometry of bright stars is expected to be limited by atmospheric scintillation, although in practice observations are often limited by other sources of systematic noise. We analyse 122 nights of bright star (𝐺 mag 11.5) photometry using the 20-cm telescopes of the Next-Generation Transit Survey (NGTS) at the Paranal Observatory in Chile. We compare the noise properties to theoretical noise models and we demonstrate that NGTS photometry of bright stars is indeed limited by atmospheric scintillation. We determine a median scintillation coefficient at the Paranal Observatory of 𝐶 Y = 1.54, which is in good agreement with previous results derived from turbulence profiling measurements at the observatory. We find that separate NGTS telescopes make consistent measurements of scintillation when simultaneously monitoring the same field. Using contemporaneous meteorological data, we find that higher wind speeds at the tropopause correlate with a decrease in long-exposure (𝑡 = 10 s) scintillation. Hence the winter months between June and August provide the best conditions for high precision photometry of bright stars at the Paranal Observatory. This work demonstrates that NGTS photometric data, collected for searching for exoplanets, contains within it a record of the scintillation conditions at Paranal.

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TOI-481 b and TOI-892 b: Two Long-period Hot Jupiters from the Transiting Exoplanet Survey Satellite

Cited by 30 publications

References 104 publications

TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration

TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration

TOI-1842b: A Transiting Warm Saturn Undergoing Re-Inflation around an Evolving Subgiant

Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory

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