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1. V907 Sco Switched to the Eclipsing Mode Again

   https://doi.org/10.3847/1538-3881/acae95  

   Zasche, Petr; Vokrouhlický, David; Barlow, Brad N.; Mašek, Martin (February 2023, The Astronomical Journal)

   Abstract V907 Scorpii is a unique triple system in which the inner binary component has been reported to have switched on and off eclipses several times in modern history. In spite of its peculiarity, observational data on this system are surprisingly scarce. Here we make use of the recent Transiting Exoplanet Survey Satellite observations, as well as our own photometric and spectroscopic data, to expand the overall data set and study the V907 Sco system in more detail. Our analysis provides both new and improved values for several of its fundamental parameters: (i) the masses of the stars in the eclipsing binary are 2.74 ± 0.02 M ⊙ and 2.56 ± 0.02 M ⊙ ; and (ii) the third component is a solar-type star with mass 1.06 − 0.10 + 0.11 M ⊙ (90% C.L.), orbiting the binary on an elongated orbit with an eccentricity of 0.47 ± 0.02 and a period of 142.01 ± 0.05 days. The intermittent intervals of time when eclipses of the inner binary are switched on and off are caused by a mutual 26 .° 2 − 2.2 + 2.6 inclination of the inner- and outer-orbit planes, and a favorable inclination of about 71° of the total angular momentum of the system. The nodal precession period is P ν = 63.5 − 2.6 + 3.3 yr. The inner binary will remain eclipsing for another ≃26 yr, offering an opportunity to significantly improve the parameters of the model. This is especially true during the next decade when the inner-orbit inclination will increase to nearly 90°. Further spectroscopic observations are also desirable, as they can help to improve constraints on the system’s orbital architecture and its physical parameters. 

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2. An Eccentric Brown Dwarf Eclipsing an M dwarf

   https://doi.org/10.3847/1538-3881/ac415f  

   Cañas, Caleb I.; Mahadevan, Suvrath; Bender, Chad F.; Salazar Rivera, Noah Isaac; Monson, Andrew; Beard, Corey; Lubin, Jack; Robertson, Paul; Gupta, Arvind F.; Cochran, William D.; et al (January 2022, The Astronomical Journal)

   Abstract We report the discovery of an M = 67 ± 2 M J brown dwarf transiting the early M dwarf TOI-2119 on an eccentric orbit ( e = 0.3362 ± 0.0005) at an orbital period of 7.200861 ± 0.000005 days. We confirm the brown dwarf nature of the transiting companion using a combination of ground-based and space-based photometry and high-precision velocimetry from the Habitable-zone Planet Finder. Detection of the secondary eclipse with TESS photometry enables a precise determination of the eccentricity and reveals the brown dwarf has a brightness temperature of 2100 ± 80 K, a value which is consistent with an early L dwarf. TOI-2119 is one of the most eccentric known brown dwarfs with P < 10 days, possibly due to the long circularization timescales for an object orbiting an M dwarf. We assess the prospects for determining the obliquity of the host star to probe formation scenarios and the possibility of additional companions in the system using Gaia EDR3 and our radial velocities. 

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3. Absolute Dimensions of the F-type Eclipsing Binary V2154 Cygni

   https://doi.org/10.3847/1538-4357/aa911a  

   Bright, Jane C.; Torres, Guillermo (November 2017, The Astrophysical Journal)
4. Four new deeply eclipsing white dwarfs in Zwicky Transient Facility

   https://doi.org/10.1093/mnras/stac1146  

   Kosakowski, A.; Kilic, M.; Brown, W. R.; Bergeron, P.; Kupfer, T. (April 2022, Monthly Notices of the Royal Astronomical Society)

   ABSTRACT We present the results of a search for deeply eclipsing white dwarfs in the Zwicky Transient Facility (ZTF) Data Release 4 (DR4). We identify nine deeply eclipsing white dwarf candidates, four of which we followed up with high-cadence photometry and spectroscopy. Three of these systems show total eclipses in the ZTF data and our follow-up Apache Point Observatory 3.5 m telescope observations. Even though the eclipse duration is consistent with sub-stellar companions, our analysis shows that all four systems contain a white dwarf with low-mass stellar companions of ∼0.1 M⊙. We provide mass and radius constraints for both stars in each system based on our photometric and spectroscopic fitting. Finally, we present a list of 41 additional eclipsing WD+M candidates identified in a preliminary search of ZTF DR7, including 12 previously studied systems. We identify two new candidate short-period, eclipsing, white dwarf–brown dwarf binaries within our sample of 41 WD+M candidates based on Pan-STARRS colours. 

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5. ASASSN-21co: A Detached Eclipsing Binary with an 11.9 yr Period

   https://doi.org/10.3847/2515-5172/ac0c83  

   Rowan, D. M.; Stanek, K. Z.; Way, Z.; Kochanek, C. S.; Jayasinghe, T.; Thompson, Todd A.; Barker, H.; Hambsch, F.-J.; Bohlsen, T.; Kafka, Stella; et al (June 2021, Research Notes of the AAS)

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