HD 1397b: A Transiting Warm Giant Planet Orbiting A V = 7.8 mag Subgiant Star Discovered by TESS

Brahm, R.; Espinoza, N.; Jordán, Andrés; Henning, Thomas; Sarkis, P.; Jones, M. I.; Díaz, Matías R.; Jenkins, James S.; Vanzi, L.; Zapata, A.; Petrovich, Cristóbal; Kossakowski, D.; Rojas, Felipe; Torres, Pascal

doi:10.3847/1538-3881/ab279a

Cited by 57 publications

(54 citation statements)

References 89 publications

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“…We now perform the same fits just described, but including the stellar density information of K2-140 on our analysis, following our discussion in Section 2.4. For this, we use the procedures described in Brahm et al (2018). Briefly, we first determine the stellar atmospheric parameters from publicly available HARPS spectra using the zaspe code (Brahm et al 2017).…”

Section: Joint-analyses With Julietmentioning

confidence: 99%

juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems

Espinoza

Kossakowski

Brahm

2019

Monthly Notices of the Royal Astronomical Society

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253

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Here we present juliet, a versatile tool for the analysis of transits, radial-velocities, or both. juliet is built over many available tools for the modelling of transits, radialvelocities and stochastic processes (here modelled as Gaussian Processes; GPs) in order to deliver a tool/wrapper which can be used for the analysis of transit photometry and radial-velocity measurements from multiple instruments at the same time, using nested sampling algorithms which allows it to not only perform a thorough sampling of the parameter space, but also to perform model comparison via bayesian evidences. In addition, juliet allows to fit transiting and non-transiting multi-planetary systems, and to fit GPs which might share hyperparameters between the photometry and radial-velocities simultaneously (e.g., stellar rotation periods), which might be useful for disentangling stellar activity in radial-velocity measurements. Nested Sampling, Importance Nested Sampling and Dynamic Nested Sampling is performed with publicly available codes which in turn give juliet multi-threading options, allowing it to scale the computing time of complicated multi-dimensional problems. We make juliet publicly available via GitHub.

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Section: Joint-analyses With Julietmentioning

confidence: 99%

juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems

Espinoza

Kossakowski

Brahm

2019

Monthly Notices of the Royal Astronomical Society

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264

253

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“…TOI-157b has a separation of A76, page 11 of 17 A&A 639, A76 (2020) just 0.03 AU to its sub-giant host star. Planets orbiting closein (a < 0.5 AU) to evolved stars are very rare (Frink et al 2001;Johnson et al 2010;Jones et al 2011) though TESS has provided several new detections around subgiants (TOI-120b, TOI-172b and TOI-197b: Nielsen et al 2019;Brahm et al 2019;Rodriguez et al 2019;Huber et al 2019;Wang et al 2019).…”

Section: Toi-157bmentioning

confidence: 99%

Three short-period Jupiters from TESS

Nielsen

Brahm

Bouchy

et al. 2020

A&A

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We report the confirmation and mass determination of three hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HIP 65Ab (TOI-129, TIC-201248411) is an ultra-short-period Jupiter orbiting a bright (V = 11.1 mag) K4-dwarf every 0.98 days. It is a massive 3.213 ± 0.078 MJ planet in a grazing transit configuration with an impact parameter of b = 1.17−0.08+0.10. As a result the radius is poorly constrained, 2.03−0.49+0.61RJ. The planet’s distance to its host star is less than twice the separation at which it would be destroyed by Roche lobe overflow. It is expected to spiral into HIP 65A on a timescale ranging from 80 Myr to a few gigayears, assuming a reduced tidal dissipation quality factor of Qs′ = 107 − 109. We performed a full phase-curve analysis of the TESS data and detected both illumination- and ellipsoidal variations as well as Doppler boosting. HIP 65A is part of a binary stellar system, with HIP 65B separated by 269 AU (3.95 arcsec on sky). TOI-157b (TIC 140691463) is a typical hot Jupiter with a mass of 1.18 ± 0.13 MJ and a radius of 1.29 ± 0.02 RJ. It has a period of 2.08 days, which corresponds to a separation of just 0.03 AU. This makes TOI-157 an interesting system, as the host star is an evolved G9 sub-giant star (V = 12.7). TOI-169b (TIC 183120439) is a bloated Jupiter orbiting a V = 12.4 G-type star. It has a mass of 0.79 ±0.06 MJ and a radius of 1.09−0.05+0.08RJ. Despite having the longest orbital period (P = 2.26 days) of the three planets, TOI-169b receives the most irradiation and is situated on the edge of the Neptune desert. All three host stars are metal rich with [Fe / H] ranging from 0.18 to0.24.

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“…4.3 and the RV-only analysis in Sect. 4.4 -that is, we implement Gaussian distributed priors for the planetary parameters, as, for example, in Brahm et al (2019), Espinoza et al (2019a), Kossakowski et al (2019), Luque et al (2019); or Bluhm et al (2020). Since we use uninformed priors for the planetary parameters for the transit and RV-only fits, nested sampling warrants an efficient exploration of the possible parameter space fitting the individual datasets.…”

Section: Joint Modellingmentioning

confidence: 99%

Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)

Kemmer

Stock

Kossakowski

et al. 2020

A&A

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We present the confirmation and characterisation of GJ 3473 b (G 50–16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf star, whose transiting signal (P = 1.1980035 ± 0.0000018 d) was first detected by the Transiting Exoplanet Survey Satellite (TESS). Through a joint modelling of follow-up radial velocity observations with CARMENES, IRD, and HARPS together with extensive ground-based photometric follow-up observations with LCOGT, MuSCAT, and MuSCAT2, we determined a precise planetary mass, Mb = 1.86 ± 0.30 M⊕, and radius, Rb = 1.264 ± 0.050 R⊕. Additionally, we report the discovery of a second, temperate, non-transiting planet in the system, GJ 3473 c, which has a minimum mass, Mc sin i = 7.41 ± 0.91 M⊕, and orbital period, Pc = 15.509 ± 0.033 d. The inner planet of the system, GJ 3473 b, is one of the hottest transiting Earth-sized planets known thus far, accompanied by a dynamical mass measurement, which makes it a particularly attractive target for thermal emission spectroscopy.

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HD 1397b: A Transiting Warm Giant Planet Orbiting A V = 7.8 mag Subgiant Star Discovered by TESS

Cited by 57 publications

References 89 publications

juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems

juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems

Three short-period Jupiters from TESS

Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)

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