TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935

Scarsdale, Nicholas; Murphy, Joseph M. Akana; Batalha, Natalie M.; Crossfield, Ian J. M.; Dressing, Courtney D.; Fulton, Benjamin J.; Howard, Andrew W.; Huber, Daniel; Isaacson, Howard; Kane, Stephen R.; Petigura, Erik A.; Robertson, Paul; Roy, Arpita; Weiss, Lauren M.; Beard, Corey; Behmard, Aida; Chontos, Ashley; Christiansen, Jessie L.; Ciardi, David R.; Claytor, Zachary R.; Collins, Karen A.; Collins, Kevin I.; Dai, Fei; Dalba, Paul A.; Dragomir, Diana; Fetherolf, Tara; Fukui, A.; Giacalone, Steven; Gonzales, Erica J.; Hill, Michelle L.; Hirsch, Lea A.; Jensen, Eric L. N.; Kosiarek, Molly R.; Leon, Jerome P. de; Polanski, Alex S.; Lund, Michael B.; Luque, R.; Mayo, Andrew W.; Močnik, Teo; Mori, Mayuko; Narita, Norio; Nowak, G.; Πάλλη, Ε.; Rosenthal, Lee J.; Rubenzahl, Ryan A.; Schlieder, Joshua E.; Shporer, Avi; Stassun, Keivan G.; Twicken, J. D.; Wang, Gavin; Yahalomi, Daniel A.; Jenkins, Jon M.; Latham, David W.; Ricker, G.; Seager, Sara; Vanderspek, R.; Winn, Joshua N.

doi:10.3847/1538-3881/ac18cb

Cited by 13 publications

(10 citation statements)

References 101 publications

(93 reference statements)

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“…We note that our initial query is agnostic to any newly confirmed systems discovered by the Transiting Exoplanet Survey Satellite that are not yet present in the NASA Exoplanet Archive. HD 73583 (Barragán et al 2022) and HD 63935 (Scarsdale et al 2021) are two such non-TTV systems that similarly abide by our restrictions and are therefore also considered for our analysis. The resulting final sample thus consists of 17 close-in, compact, non-TTV systems containing a total of 42 planets.…”

Section: All Planets Have Rv Mass Measurements With Fractionalmentioning

confidence: 99%

Generalized Peas in a Pod: Extending Intra-system Mass Uniformity to Non-TTV Systems via the Gini Index

Goyal

Wang

2022

ApJ

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It has been demonstrated that planets belonging to the same close-in, compact multiple-planet system tend to exhibit a striking degree of uniformity in their sizes. A similar trend has also been found to hold for the masses of such planets, but considerations of such intra-system mass uniformity have generally been limited to statistical samples wherein a majority of systems have constituent planetary mass measurements obtained via analysis of transit timing variations (TTVs). Since systems with strong TTV signals typically lie in or near mean motion resonance, it remains to be seen whether intra-system mass uniformity is still readily emergent for nonresonant systems with non-TTV mass provenance. We thus present in this work a mass uniformity analysis of 17 non-TTV systems with masses measured via radial velocity measurements. Using the Gini index, a common statistic for economic inequality, as our primary metric for uniformity, we find that our sample of 17 non-TTV systems displays intra-system mass uniformity at a level of ∼2.5σ confidence. We provide additional discussion of possible statistical and astrophysical underpinnings for this result. We also demonstrate the existence of a correlation (r = 0.25) between characteristic solid surface density (Σ0) of the minimum-mass extrasolar nebula and system mass Gini index, suggesting that more-massive disks may generally form systems with more-unequal planetary masses.

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Section: All Planets Have Rv Mass Measurements With Fractionalmentioning

confidence: 99%

Generalized Peas in a Pod: Extending Intra-system Mass Uniformity to Non-TTV Systems via the Gini Index

Goyal

Wang

2022

ApJ

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“…The TKS Collaboration aims to precisely measure the stellar properties of this sample using spectra taken with the High-Resolution Spectrograph (HIRES; Vogt et al 1994) on the Keck I telescope at the W. M. Keck Observatory. These spectra also allow us to dynamically confirm the planetary nature of the TKS TOIs through the measurement of precise radial velocities (RVs), leading to numerous planet discoveries among the TKS team (e.g., Dai et al 2020;Dalba et al 2020;MacDougall et al 2021;Rubenzahl et al 2021;Scarsdale et al 2021;Weiss et al 2021;Dalba et al 2022;Lubin et al 2022;MacDougall et al 2022;Turtelboom et al 2022;Van Zandt et al 2023).…”

Section: Introductionmentioning

confidence: 99%

The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars

MacDougall

Petigura

Gilbert

et al. 2023

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We present the stellar and planetary properties for 85 TESS Objects of Interest (TOIs) hosting 108 planet candidates that compose the TESS-Keck Survey (TKS) sample. We combine photometry, high-resolution spectroscopy, and Gaia parallaxes to measure precise and accurate stellar properties. We then use these parameters as inputs to a light-curve processing pipeline to recover planetary signals and homogeneously fit their transit properties. Among these transit fits, we detect significant transit-timing variations among at least three multiplanet systems (TOI-1136, TOI-1246, TOI-1339) and at least one single-planet system (TOI-1279). We also reduce the uncertainties on planet-to-star radius ratios R p /R ⋆ across our sample, from a median fractional uncertainty of 8.8% among the original TOI Catalog values to 3.0% among our updated results. With this improvement, we are able to recover the Radius Gap among small TKS planets and find that the topology of the Radius Gap among our sample is broadly consistent with that measured among Kepler planets. The stellar and planetary properties presented here will facilitate follow-up investigations of both individual TOIs and broader trends in planet properties, system dynamics, and the evolution of planetary systems.

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“…The TESS-Keck Survey (TKS; Chontos et al 2022), a multisemester Doppler monitoring campaign of promising TESS planet candidates with the Keck-HIRES and APF-Levy spectrographs, is working to provide the precise planet mass measurements required by future efforts in atmospheric characterization, among other investigations (e.g., Lubin et al 2022;Scarsdale et al 2021). TKS science falls along four main axes: (1) planet bulk composition, (2) system architectures and dynamics, (3) planet atmospheres, and (4) evolved systems.…”

Section: The Tess-keck Survey: Planet Atmospheresmentioning

confidence: 99%

The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems

Akana Murphy,

Batalha,

Scarsdale

et al. 2023

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With JWST’s successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become the bottleneck for characterizing the atmospheres of small exoplanets via transmission spectroscopy. Using a carefully curated target list and observations from more than 2 yr of APF-Levy and Keck-HIRES Doppler monitoring, the TESS-Keck Survey is working toward alleviating this pressure. Here we present mass measurements for 11 transiting planets in eight systems that are particularly suited to atmospheric follow-up with JWST. We also report the discovery and confirmation of a temperate super-Jovian-mass planet on a moderately eccentric orbit. The sample of eight host stars, which includes one subgiant, spans early-K to late-F spectral types (T eff = 5200–6200 K). We homogeneously derive planet parameters using a joint photometry and radial velocity modeling framework, discuss the planets’ possible bulk compositions, and comment on their prospects for atmospheric characterization.

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TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935

Cited by 13 publications

References 101 publications

Generalized Peas in a Pod: Extending Intra-system Mass Uniformity to Non-TTV Systems via the Gini Index

Generalized Peas in a Pod: Extending Intra-system Mass Uniformity to Non-TTV Systems via the Gini Index

The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars

The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems

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