A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS

Nielsen, L. D.; Bouchy, F.; Turner, O. D.; Giles, H.; Mascareño, A. Suárez; Lovis, C.; Marmier, M.; Pepe, F.; Ségransan, D.; Udry, S.; Otegi, J. F.; Ottoni, G.; Stalport, M.; Ricker, G.; Vanderspek, R.; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Kane, Stephen R.; Wittenmyer, R. A.; Bowler, Brendan P.; Crossfield, Ian J. M.; Horner, Jonathan; Kielkopf, John F.; Morton, Timothy; Plavchan, Peter; Tinney, C. G.; Zhang, Hui; Wright, Duncan; Mengel, M. W.; Clark, Jake T.; Okumura, Jack; Addison, Brett C.; Caldwell, Douglas A.; Cartwright, Scott; Collins, Karen A.; Francis, James; Guerrero, Natalia; Huang, Chelsea X.; Matthews, Elisabeth C.; Pepper, Joshua; Rose, Mark; Villaseñor, J.; Wohler, Bill; Stassun, Keivan G.; Howell, Steve B.; Ciardi, David R.; Gonzales, Erica J.; Matson, Rachel A.; Beichman, Charles; Schlieder, Joshua E.

doi:10.1051/0004-6361/201834577

Cited by 45 publications

(31 citation statements)

References 79 publications

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“…For these bright stars and large candidate signals, Minerva-Australis is easily able to obtain new precise RV measurements (e.g. Nielsen et al 2019;Vanderburg et al 2019) over the coming years to clarify the nature of these objects.…”

Section: Candidate Signalsmentioning

confidence: 99%

The Pan-Pacific Planet Search – VIII. Complete results and the occurrence rate of planets around low-luminosity giants

Wittenmyer

Butler

Horner

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Our knowledge of the populations and occurrence rates of planets orbiting evolved intermediate-mass stars lags behind that for solar-type stars by at least a decade. Some radial velocity surveys have targeted these low-luminosity giant stars, providing some insights into the properties of their planetary systems. Here we present the final data release of the Pan-Pacific Planet Search, a 5-year radial velocity survey using the 3.9m Anglo-Australian Telescope. We present 1293 precise radial velocity measurements for 129 stars, and highlight six potential substellar-mass companions which require additional observations to confirm. Correcting for the substantial incompleteness in the sample, we estimate the occurrence rate of giant planets orbiting low-luminosity giant stars to be approximately 7.8 +9.1 −3.3 %. This result is consistent with the frequency of such planets found to orbit main-sequence A-type stars, from which the PPPS stars have evolved.

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Section: Candidate Signalsmentioning

confidence: 99%

The Pan-Pacific Planet Search – VIII. Complete results and the occurrence rate of planets around low-luminosity giants

Wittenmyer

Butler

Horner

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…Both Kepler and TESS, the most successful planet discovery factories of the past decade and coming years, respectively, are heavily biased towards finding planets moving on orbits with periods measured in days and weeks, rather than years and decades (e.g. Borucki et al 2010;Batalha et al 2013;Rowe et al 2014;Ricker et al 2015;Barclay et al 2018;Nielsen et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search

Wittenmyer

Wang

Horner

et al. 2019

Monthly Notices of the Royal Astronomical Society

123

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Our understanding of planetary systems different to our own has grown dramatically in the past 30 years. However, our efforts to ascertain the degree to which the Solar system is abnormal or unique have been hindered by the observational biases inherent to the methods that have yielded the greatest exoplanet hauls. On the basis of such surveys, one might consider our planetary system highly unusual -but the reality is that we are only now beginning to uncover the true picture. In this work, we use the full eighteen-year archive of data from the Anglo-Australian Planet Search to examine the abundance of 'Cool Jupiters' -analogs to the Solar system's giant planets, Jupiter and Saturn. We find that such planets are intrinsically far more common through the cosmos than their siblings, the hot Jupiters. We find that the occurrence rate of such 'Cool Jupiters' is 6.73 +2.09 −1.13 %, almost an order of magnitude higher than the occurrence of hot Jupiters (at 0.84 +0.70 −0.20 %). We also find that the occurrence rate of giant planets is essentially constant beyond orbital distances of ∼1 au. Our results reinforce the importance of legacy radial velocity surveys for the understanding of the Solar system's place in the cosmos.

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“…Candidate alerts and full-frame images are released every month. As of March 2019, TESS has already announced the discovery of about a dozen transiting planets (see, e.g., Esposito et al 2019;Gandolfi et al 2018;Huang et al 2018;Jones et al 2018;Nielsen et al 2019;Quinn et al 2019;Trifonov et al 2019).…”

Section: Introductionmentioning

confidence: 99%

The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap

Gandolfi

Fossati

Livingston

et al. 2019

ApJL

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We report the discovery of a super-Earth and a sub-Neptune transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V = 9) K1 dwarf observed by the Transiting Exoplanet Survey Satellite (TESS ) in Sectors 3 and 4. We combine the TESS photometry with archival HARPS spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets. With an orbital period of 4.8 days, a mass of 7.51 +1.09 −1.01 M ⊕ , and a radius of 1.64 ± 0.06 R ⊕ , HD 15337 b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD 15337 c has an orbital period of 17.2 days, a mass of 8.11 +1.82 −1.69 M ⊕ , and a radius of 2.39 ± 0.12 R ⊕ , suggesting that the planet might be surrounded by a thick atmospheric envelope. The two planets have similar masses and lie on opposite sides of the radius gap, and are thus an excellent testbed for planet formation and evolution theories. Assuming that HD 15337 c hosts a hydrogendominated envelope, we employ a recently developed planet atmospheric evolution algorithm in a Bayesian framework to estimate the history of the high-energy (extreme ultraviolet and X-ray) emission of the host star. We find that at an age of 150 Myr, the star possessed on average between 3.7 and 127 times the high-energy luminosity of the current Sun.

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A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS

Cited by 45 publications

References 79 publications

The Pan-Pacific Planet Search – VIII. Complete results and the occurrence rate of planets around low-luminosity giants

The Pan-Pacific Planet Search – VIII. Complete results and the occurrence rate of planets around low-luminosity giants

Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search

The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap

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