GJ 3929: High Precision Photometric and Doppler Characterization of an Exo-Venus and its Hot, Mini-Neptune-mass Companion
| Autor: | Beard, Corey, Robertson, Paul, Kanodia, Shubham, Lubin, Jack, Cañas, Caleb I., Gupta, Arvind F., Holcomb, Rae, Jones, Sinclaire, Libby-Roberts, Jessica E., Lin, Andrea S. J., Mahadevan, Suvrath, Stefánsson, Guðmundur, Bender, Chad F., Blake, Cullen H., Cochran, William D., Endl, Michael, Everett, Mark, Ford, Eric B., Fredrick, Connor, Halverson, Samuel, Hebb, Leslie, Li, Dan, Logsdon, Sarah E., Luhn, Jacob, McElwain, Michael W., Metcalf, Andrew J., Ninan, Joe P., Rajagopal, Jayadev, Roy, Arpita, Schutte, Maria, Schwab, Christian, Terrien, Ryan C., Wisniewski, John, Wright, Jason T. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/ac8480 |
| Popis: | We detail the follow up and characterization of a transiting exo-Venus identified by TESS, GJ 3929b, (TOI-2013b) and its non-transiting companion planet, GJ 3929c (TOI-2013c). GJ 3929b is an Earth-sized exoplanet in its star's Venus-zone (P$_{b}$ = 2.616272 $\pm$ 0.000005 days; S$_{b}$ = 17.3$^{+0.8}_{-0.7}$ S$_{\oplus}$) orbiting a nearby M dwarf. GJ 3929c is most likely a non-transiting sub-Neptune. Using the new, ultra-precise NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak National Observatory, we are able to modify the mass constraints of planet b reported in previous works and consequently improve the significance of the mass measurement to almost 4$\sigma$ confidence (M$_{b}$ = 1.75 $\pm$ 0.45 M$_{\oplus}$). We further adjust the orbital period of planet c from its alias at 14.30 $\pm$ 0.03 days to the likely true period of 15.04 $\pm$ 0.03 days, and adjust its minimum mass to m$\sin i$ = 5.71 $\pm$ 0.92 M$_{\oplus}$. Using the diffuser-assisted ARCTIC imager on the ARC 3.5 m telescope at Apache Point Observatory, in addition to publicly available TESS and LCOGT photometry, we are able to constrain the radius of planet b to R$_{p}$ = 1.09 $\pm$ 0.04 R$_{\oplus}$. GJ 3929b is a top candidate for transmission spectroscopy in its size regime (TSM = 14 $\pm$ 4), and future atmospheric studies of GJ 3929b stand to shed light on the nature of small planets orbiting M dwarfs. Comment: Accepted for publication in ApJ. arXiv admin note: text overlap with arXiv:2204.09063 |
| Databáze: | arXiv |
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