The TESS-Keck Survey. XVIII. A Sub-Neptune and Spurious Long-period Signal in the TOI-1751 System

Desai, Anmol; Turtelboom, Emma V.; Harada, Caleb K.; Dressing, Courtney D.; Rice, David R.; Murphy, Joseph M. Akana; Brinkman, Casey L.; Chontos, Ashley; Crossfield, Ian J. M.; Dai, Fei; Hill, Michelle L.; Fetherolf, Tara; Giacalone, Steven; Howard, Andrew W.; Huber, Daniel; Isaacson, Howard; Kane, Stephen R.; Lubin, Jack; MacDougall, Mason G.; Mayo, Andrew W.; Močnik, Teo; Polanski, Alex S.; Rice, Malena; Robertson, Paul; Rubenzahl, Ryan A.; Van Zandt, Judah; Weiss, Lauren M.; Bieryla, Allyson; Buchhave, Lars A.; Jenkins, Jon M.; Kostov, Veselin B.; Levine, Alan M.; Lillo-Box, Jorge; Paegert, M.; Rabus, Markus; Seager, S.; Stassun, Keivan G.; Ting, Eric B.; Watanabe, David; Winn, Joshua N.

doi:10.3847/1538-3881/ad29ee

Cited by 2 publications

(1 citation statement)

References 133 publications

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“…HD 146757 (Desai et al 2024) benefited from APF data through the identification of an alias in the HIRES data. This case highlights APF's strength as a sanity check when searching for long-period, massive companions with limited primary survey instrument data.…”

Section: Apf As Survey Supportmentioning

confidence: 99%

The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets

Polanski,

Lubin,

Beard

et al. 2024

ApJS

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The Transiting Exoplanet Survey Satellite (TESS) has discovered hundreds of new worlds, with TESS planet candidates now outnumbering the total number of confirmed planets from Kepler. Owing to differences in survey design, TESS continues to provide planets that are better suited for subsequent follow-up studies, including mass measurement through radial velocity (RV) observations, compared to Kepler targets. In this work, we present the TESS-Keck Survey’s (TKS) Mass Catalog: a uniform analysis of all TKS RV survey data that has resulted in mass constraints for 126 planets and candidate signals. This includes 58 mass measurements that have reached ≥5σ precision. We confirm or validate 32 new planets from the TESS mission either by significant mass measurement (15) or statistical validation (17), and we find no evidence of likely false positives among our entire sample. This work also serves as a data release for all previously unpublished TKS survey data, including 9,204 RV measurements and associated activity indicators over our three-year survey. We took the opportunity to assess the performance of our survey and found that we achieved many of our goals, including measuring the mass of 38 small (<4 R ⊕) planets, nearly achieving the TESS mission’s basic science requirement. In addition, we evaluated the performance of the Automated Planet Finder as survey support and observed meaningful constraints on system parameters, due to its more uniform phase coverage. Finally, we compared our measured masses to those predicted by commonly used mass–radius relations and investigated evidence of systematic bias.

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Section: Apf As Survey Supportmentioning

confidence: 99%

The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets

Polanski,

Lubin,

Beard

et al. 2024

ApJS

Self Cite

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Shallower radius valley around low-mass hosts: evidence for icy planets, collisions, or high-energy radiation scatter

Ho,

Rogers,

Van Eylen

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The radius valley, i.e., a dearth of planets with radii between 1.5 and 2 Earth radii, provides insights into planetary formation and evolution. Using homogenously revised planetary parameters from Kepler 1-minute short cadence light curves, we remodel transits of 72 small planets mostly orbiting low-mass stars, improving the precision and accuracy of planet parameters. By combining this sample with a similar sample of planets around higher-mass stars, we determine the depth of the radius valley as a function of stellar mass. We find that the radius valley is shallower for low-mass stars compared to their higher mass counterparts. Upon comparison, we find that theoretical models of photoevaporation under-predict the number of planets observed inside the radius valley for low-mass stars: with decreasing stellar mass, the predicted fraction of planets inside the valley remains approximately constant whereas the observed fraction increases. We argue that this provides evidence for the presence of icy planets around low-mass stars. Alternatively, planets orbiting low-mass stars undergo more frequent collisions and scatter in the stars’ high-energy output may also cause planets to fill the valley. We predict that more precise mass measurements for planets orbiting low mass stars would be able to distinguish between these scenarios.

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The TESS-Keck Survey. XVIII. A Sub-Neptune and Spurious Long-period Signal in the TOI-1751 System

Abstract: We present and confirm TOI-1751 b, a transiting sub-Neptune orbiting a slightly evolved, solar-type, metal-poor star (T eff = 5996 ± 110 K, log ( g ) = 4.2 ± 0.1 , V = 9.3 mag, [Fe/H] = −0.40 ± 0.… Show more

Cited by 2 publications

References 133 publications

The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets

The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets

Shallower radius valley around low-mass hosts: evidence for icy planets, collisions, or high-energy radiation scatter

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