Planet Hunters Talk

Mass and Radius of this Star?

  • Ptd by Ptd

    Hi Sorry I've got another pile of questions caused by this one, it has a set of transits in it, but when I went to plug the numbers into Kianjin's Planetery Calculator http://www.kianjin.com/pcalc.html I realized that unlike in K1 there isn't a Mass and Radius listed for these stars, and without that, or at least a ballpark on the Radius I don't see how you can say how large the planet is, I looked the star up in VizieR and I couldn't see those particular numbers in there either. Is this information just not available for K2 stars? Or do we need to somehow try and estimate it ourselves? If so I do hope there is a program or set of tables somewhere that you can plug what info you do have into and it'll give you some kind of answer, if not I expect someone will need to lob a primer on stellar mechanics at me?

    Posted

  • ajamyajax by ajamyajax in response to Ptd's comment.

    Yes Ptd, unfortunately K2 stellar radius and mass values are not available just yet. Al Schmitt, the developer of LcViewer, told his user group that K2 stellar radius will be added to the NEA table 'soon' I believe and presumably mass will be as well. But in the meantime we just have to wait. After they are you can find these values on the Archive presumably or easily bring them up in Al's LcViewer. And you can msg him here on PH if you are interested in using his program.

    Also for now, we can guess at the radius and masses of stars using simple color math from data that is currently available. Maybe others know of a better way and will post ideas about how, but until then you can read more about that here perhaps:

    "Kepler stellar properties study"

    http://talk.planethunters.org/#/boards/BPH0000007/discussions/DPH0000npe

    And sorry if this method isn't easy and obvious, but with a little work with data it really isn't that difficult.

    So again hope this helps and best of luck.

    Posted