FN Lyr - Low-mass companion?

Something similar is reported in Period analysis of two non-Blazhko RRab stars, FN Lyr and V894 Cyg, based on Kepler photometry: evidence of low-mass companions on wider orbits but I could not access full text in any way.

Try sci-hub.org

Stalker wrote:

Try sci-hub.org

Nothing.

I get a 404 - Not Found

Ok, try to write 10.1093/mnras/stu1344 in the search bar of sci-hub.org

Well, for whatever reason, your link is working now.

According to the second paper the FN Lyrae's planet have a mass of only 1.3 Mearth O_o. Is the 10^-6 an error?

Is that sci-hub.org site legal?

FN Lyr ≠ FL Lyr

Also the spectroscopic binary mass function f(M) is not the mass, or even the minimum mass.

f(M) = (m sin i)³ / (M + m)²

So assuming the approximation M ≫ m:

m sin i ≈ [f(M) × M²]^⅓

Ho thanks. It make max Msini of 10 and 40 Mj planet and brown dwarf if the stars are classical RR Lyrae variables with half of the sun's mass or less. Sci-hub is as legal as any streaming website, but cops wont come at your home if you use it.

Any data concerning stellar parameters of FN Lyr and *V894 Cyg? They seem quite low-mass stars but spectral type should be F or G, right?

Maybe the FN Lyrae stuff should be moved into its own thread?

According to this page, RR Lyrae stars typically have spectral types A2–F6. This source gives A5III for FN Lyrae, but bear in mind that RR Lyrae variables are pulsating so it could vary over the course of the cycle.

Lazarus wrote:

Maybe the FN Lyrae stuff should be moved into its own thread?

Excellent suggestion. Done.