Gaia astrometry shows lower-than-predicted RUWE values for LSP stars, disfavoring low-mass binary companions as the origin of long secondary periods in red giants.
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The Via Project is a planned five-year dual-hemisphere spectroscopic survey targeting over 2 million stars with 100 m/s RV stability and transient spectroscopy to r~24 using instruments on MMT and Magellan/Clay telescopes starting in 2027.
Gaia astrometry remains consistent with a binary origin for long secondary periods once sample contamination by semi-regular variables is accounted for.
citing papers explorer
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Gaia astrometry disfavors a binary origin for long secondary periods
Gaia astrometry shows lower-than-predicted RUWE values for LSP stars, disfavoring low-mass binary companions as the origin of long secondary periods in red giants.
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The Via Project: Overview of the Science, Instrument, and Survey
The Via Project is a planned five-year dual-hemisphere spectroscopic survey targeting over 2 million stars with 100 m/s RV stability and transient spectroscopy to r~24 using instruments on MMT and Magellan/Clay telescopes starting in 2027.
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Eppur binaria non \'e esclusa: Gaia astrometry does not disfavor a binary origin for Long Secondary Periods
Gaia astrometry remains consistent with a binary origin for long secondary periods once sample contamination by semi-regular variables is accounted for.