The new #Keck target - an #RRLyrae star at the outskirts of our Galaxy in the #halo; the Virgo Cluster is too low now - has been placed behind the spectrograph slit marked with the cursor (and thus can't be seen by the guide camera now). A 45-minute exposure of a spectrum is now being taken: the goal is its #radialvelocity, for determining the #Galaxy's mass and looking for a reflex motion of the whole Milky Way caused by its Large Magellanic Cloud neighbor.

The new #Keck target - an #RRLyrae star at the outskirts of our Galaxy in the #halo; the Virgo Cluster is too low now - has been placed behind the spectrograph slit marked with the cursor (and thus can't be seen by the guide camera now). A 45-minute exposure of a spectrum is now being taken. The goal is its #radialvelocity, for determining the #Galaxy's mass and looking for a reflex motion if the Milky Way caused by the Large Magellanic Cloud.

Constraints for the orbital #inclination and the true mass of long-period single companions.

This work illustrates how #Gaia and #Hipparcos allow for the orbital properties and masses of long-period RV companions to be further constrained.

The first constraints for nearby long-period #planets from Gaia have started getting published.

#astronomy #exoplanets #radialvelocity #astrometry
https://arxiv.org/abs/2301.01263

All my #conference #presentations of 2022 are now uploaded to #Zenodo. This includes the slides for my presentations at Exoplanets 4, EAS 2022, Cool Stars 21 and a few smaller conferences. #Exoplanets #RadialVelocity #StellarActivity #Astrophysics

You can find links to all of them here: https://asuarezmascareno.com/seminars-and-conference-talks/

A massive joint #observation campaign is in preparation.

We are talking about a dozen high-precision #RadialVelocity instruments (blue), mounted on large (2m-10m) #telescopes + a dozen professional 1m-class #photometric telescopes (red) + hundreds of potential #citizen #scientists to observe altogether the same #exoplanet #transit...

#StayTuned

#astronomy #Astrodon #astrophysics #AstronomerLife #exoplanets