The Orbital Eccentricity--Radius Distribution for Warm, Single Planets in TESS
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917288892956672 |
|---|---|
| author | Fairnington, Tyler R. Dong, Jiayin Huang, Chelsea X. Nabbie, Emma Zhou, George Wright, Duncan Collins, Karen A. Ciardi, David Jenkins, Jon M. Latham, David W. Ricker, George Quinn, Samuel N. Seager, Sara Shporer, Avi Vanderspek, Roland Winn, Joshua N. Barkaoui, Khalid Bieryla, Allyson Buchhave, Lars Cheryasov, Dmitry Christiansen, Jessie Dressing, Courtney Fukui, Akihiko Garmash, Alexey Giacalone, Steven Hintz, Eric G. Howell, Steve B. Isogai, Keisuke de Leon, Jerome Lillo-Box, Jorge Murgas, Felipe Narita, Norio Nielsen, Louise D. Palle, Enric Rabus, Markus Rackham, Benjamin V. Schwarz, Richard P. Srdoc, Gregor Stephens, Denise C. Wang, Gavin Watanabe, Noriharu Wilkin, Francis P. Williams, Joe |
| author_facet | Fairnington, Tyler R. Dong, Jiayin Huang, Chelsea X. Nabbie, Emma Zhou, George Wright, Duncan Collins, Karen A. Ciardi, David Jenkins, Jon M. Latham, David W. Ricker, George Quinn, Samuel N. Seager, Sara Shporer, Avi Vanderspek, Roland Winn, Joshua N. Barkaoui, Khalid Bieryla, Allyson Buchhave, Lars Cheryasov, Dmitry Christiansen, Jessie Dressing, Courtney Fukui, Akihiko Garmash, Alexey Giacalone, Steven Hintz, Eric G. Howell, Steve B. Isogai, Keisuke de Leon, Jerome Lillo-Box, Jorge Murgas, Felipe Narita, Norio Nielsen, Louise D. Palle, Enric Rabus, Markus Rackham, Benjamin V. Schwarz, Richard P. Srdoc, Gregor Stephens, Denise C. Wang, Gavin Watanabe, Noriharu Wilkin, Francis P. Williams, Joe |
| contents | We characterize the radius-dependent eccentricity distribution of 347 warm (P = 8-200 days) systems with only one transiting planetary candidate identified during Sectors 1-69 of the TESS mission. Using the ``photoeccentric effect'' in a hierarchical Bayesian framework, we first model the population using discrete planetary size bins (sub-Neptunes, sub-Saturns, and Jovians). We then develop a continuous mixture model with weights governed by a logistic sigmoid function of radius. We find that the warm-single population is best described by two components: a dominant low-eccentricity mode ( <e_low> = 0.070-0.068+0.026) and a secondary dynamically excited mode (<e_high> = 0.616-0.075+0.091). The fraction of planets belonging to this high-eccentricity component increases strongly with planet radius, characterized by a transition at a break radius of R_br = 9.8-1.1+1.4 R_e. This trend places warm sub-Saturns predominantly on the same low-eccentricity track as sub-Neptunes. In contrast, warm Jovians (8--16 R_e) are frequently eccentric, with 59+-13% of the population in the high eccentricity mode. We detect this bimodality at >4sigma, providing statistically significant evidence that warm gas giants are sculpted by two distinct pathways, or a single mechanism with subsequent eccentricity excitation. Finally, we identify a non-negligible tail of highly eccentric sub-Neptunes (1--4 R_e), which comprise 14.9-6.5+5.1% of the population, consistent with excitation by non-transiting external companions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20015 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Orbital Eccentricity--Radius Distribution for Warm, Single Planets in TESS Fairnington, Tyler R. Dong, Jiayin Huang, Chelsea X. Nabbie, Emma Zhou, George Wright, Duncan Collins, Karen A. Ciardi, David Jenkins, Jon M. Latham, David W. Ricker, George Quinn, Samuel N. Seager, Sara Shporer, Avi Vanderspek, Roland Winn, Joshua N. Barkaoui, Khalid Bieryla, Allyson Buchhave, Lars Cheryasov, Dmitry Christiansen, Jessie Dressing, Courtney Fukui, Akihiko Garmash, Alexey Giacalone, Steven Hintz, Eric G. Howell, Steve B. Isogai, Keisuke de Leon, Jerome Lillo-Box, Jorge Murgas, Felipe Narita, Norio Nielsen, Louise D. Palle, Enric Rabus, Markus Rackham, Benjamin V. Schwarz, Richard P. Srdoc, Gregor Stephens, Denise C. Wang, Gavin Watanabe, Noriharu Wilkin, Francis P. Williams, Joe Earth and Planetary Astrophysics We characterize the radius-dependent eccentricity distribution of 347 warm (P = 8-200 days) systems with only one transiting planetary candidate identified during Sectors 1-69 of the TESS mission. Using the ``photoeccentric effect'' in a hierarchical Bayesian framework, we first model the population using discrete planetary size bins (sub-Neptunes, sub-Saturns, and Jovians). We then develop a continuous mixture model with weights governed by a logistic sigmoid function of radius. We find that the warm-single population is best described by two components: a dominant low-eccentricity mode ( <e_low> = 0.070-0.068+0.026) and a secondary dynamically excited mode (<e_high> = 0.616-0.075+0.091). The fraction of planets belonging to this high-eccentricity component increases strongly with planet radius, characterized by a transition at a break radius of R_br = 9.8-1.1+1.4 R_e. This trend places warm sub-Saturns predominantly on the same low-eccentricity track as sub-Neptunes. In contrast, warm Jovians (8--16 R_e) are frequently eccentric, with 59+-13% of the population in the high eccentricity mode. We detect this bimodality at >4sigma, providing statistically significant evidence that warm gas giants are sculpted by two distinct pathways, or a single mechanism with subsequent eccentricity excitation. Finally, we identify a non-negligible tail of highly eccentric sub-Neptunes (1--4 R_e), which comprise 14.9-6.5+5.1% of the population, consistent with excitation by non-transiting external companions. |
| title | The Orbital Eccentricity--Radius Distribution for Warm, Single Planets in TESS |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2602.20015 |