text: 75,24,1432451504569528320,19333650,Vedant Chandra,"I'm pleased to announce our new paper, one of the first scientific results from the fifth-generation Sloan Digital Sky Survey: A 99-minute Double-lined White Dwarf Binary from SDSS-V <LINK> Searching for binary white dwarfs has been a central theme of my undergraduate research, and we've developed several tools to help us find these systems. Our pipeline flagged this candidate due to variations in the absorption lines across SDSS-V sub-exposures <LINK> We quickly obtained time-resolved @GeminiObs spectra under the Fast-Turnaround program (shown here), and also got UV fluxes from the @NASAUniverse Swift space observatory. These helped us solve the orbital and stellar parameters of the system <LINK> The upshot: this is a 99-minute WD+WD binary in which both stars are visible on the spectrum. This 'double-lined' or 'SB2' nature is relatively rare (only ~ 20 such WD+WD systems are known), and it allows us to precisely estimate the masses of both WDs <LINK> The short period and close distance of 113 pc (from @ESAGaia) imply that this system is a powerful source of millihertz gravitational waves, detectable by future space-based observatories. Due to the precisely determined system parameters, it could even be a verification source. <LINK> Gravitational wave emission will cause the system's orbit to shrink over time, and we estimate that the two stars will get close enough to interact and merge within ~ 220 million years ('soon' in astronomical terms...) Once the stars merge, they will probably create a 'reborn' helium star that will eventually evolve into a single helium WD. There might be a few thermonuclear explosions along the way, but the system is probably not massive enough to produce a Type Ia supernova. This paper went from discovery to publication in exactly four months, which would not have been possible without the fantastic resources @GeminiObs and @NASAUniverse Swift provide for fast-turnaround proposals. Thanks to the entire @sdssurveys @MilkyWayMapper collaboration for supporting this work, and especially my co-authors, some of whom are on Twitter: @hc_hwang @jotajotahermes @evbauer_astro. We look forward to finding more interesting systems in SDSS-V! @SuperASASSN the thread you requested! @StellarTayar We tried sketching a rough picture in Section 5, but it's quite uncertain. I think it's plausible the original progenitors were ~ 1-1.5 Msun, and also that the 0.32 Msun WD formed first. Let me know if there's anything else I can clarify!",https://arxiv.org/abs/2108.11968,"We report the discovery of SDSS J133725.26+395237.7 (hereafter SDSS J1337+3952), a double-lined white dwarf (WD+WD) binary identified in early data from the fifth generation Sloan Digital Sky Survey (SDSS-V). The double-lined nature of the system enables us to fully determine its orbital and stellar parameters with follow-up Gemini spectroscopy and Swift UVOT ultraviolet fluxes. The system is nearby ($d = 113$ pc), and consists of a $0.51\, M_\odot$ primary and a $0.32\, M_\odot$ secondary. SDSS J1337+3952 is a powerful source of gravitational waves in the millihertz regime, and will be detectable by future space-based interferometers. Due to this gravitational wave emission, the binary orbit will shrink down to the point of interaction in $\approx 220$ Myr. The inferred stellar masses indicate that SDSS J1337+3952 will likely not explode as a Type Ia supernova (SN Ia). Instead, the system will probably merge and evolve into a rapidly rotating helium star, and could produce an under-luminous thermonuclear supernova along the way. The continuing search for similar systems in SDSS-V will grow the statistical sample of double-degenerate binaries across parameter space, constraining models of binary evolution and SNe Ia. ",A 99-minute Double-lined White Dwarf Binary from SDSS-V,11,"[""I'm pleased to announce our new paper, one of the first scientific results from the fifth-generation Sloan Digital Sky Survey: A 99-minute Double-lined White Dwarf Binary from SDSS-V <LINK>"", ""Searching for binary white dwarfs has been a central theme of my undergraduate research, and we've developed several tools to help us find these systems. Our pipeline flagged this candidate due to variations in the absorption lines across SDSS-V sub-exposures https://t.co/U6TRXWFw7p"", 'We quickly obtained time-resolved @GeminiObs spectra under the Fast-Turnaround program (shown here), and also got UV fluxes from the @NASAUniverse Swift space observatory. These helped us solve the orbital and stellar parameters of the system https://t.co/sGq0tbW2ZX', ""The upshot: this is a 99-minute WD+WD binary in which both stars are visible on the spectrum. This 'double-lined' or 'SB2' nature is relatively rare (only ~ 20 such WD+WD systems are known), and it allows us to precisely estimate the masses of both WDs https://t.co/nC1xPScWEI"", 'The short period and close distance of 113 pc (from @ESAGaia) imply that this system is a powerful source of millihertz gravitational waves, detectable by future space-based observatories. Due to the precisely determined system parameters, it could even be a verification source. https://t.co/CLPKJMhkwL', ""Gravitational wave emission will cause the system's orbit to shrink over time, and we estimate that the two stars will get close enough to interact and merge within ~ 220 million years ('soon' in astronomical terms...)"", ""Once the stars merge, they will probably create a 'reborn' helium star that will eventually evolve into a single helium WD. There might be a few thermonuclear explosions along the way, but the system is probably not massive enough to produce a Type Ia supernova."", 'This paper went from discovery to publication in exactly four months, which would not have been possible without the fantastic resources @GeminiObs and @NASAUniverse Swift provide for fast-turnaround proposals.', 'Thanks to the entire @sdssurveys @MilkyWayMapper collaboration for supporting this work, and especially my co-authors, some of whom are on Twitter: @hc_hwang @jotajotahermes @evbauer_astro. We look forward to finding more interesting systems in SDSS-V!', '@SuperASASSN the thread you requested!', ""@StellarTayar We tried sketching a rough picture in Section 5, but it's quite uncertain. I think it's plausible the original progenitors were ~ 1-1.5 Msun, and also that the 0.32 Msun WD formed first. Let me know if there's anything else I can clarify!""]",21,08,2491