Tuesday, March 26, 2024

starquaKe

Epsilon Indi A at 3.6 pc owns a superSaturn at 11 AU - thrice Jupiter mass; also that browndwarf binary (Ba/b) out at 11600 AU.

Projected temperature of the planet, at 4 Gy, is 200 K so is an infrared opportunity - that is, Webb. The planet's orbit is eccentric. This leapyearday another reading picked up a ten-Jovian mass, maybe a second planet.

ε Indi itself just made news for quaking. This was not spotted by the JWST. Rather: the ESPRESSO spectrograph, mounted at the European Southern Observatory’s (ESO) Very Large Telescope (VLT). The team, headed by Tiago Campante and Bill Chaplin, hit the stellar temperature at 4500 K (we're 5500). The quake stands to get us a look at the star's innards. Constraining this star stands to help constrain main-sequence K stars... everywhere.

Chaplin reports a discrepancy between the predicted and observed sizes. I didn't know that K stars had been predicted wrong - we're right next to one, orbiting Alpha Centauri, so I thought we knew more about them. But maybe our observations are outdated and/or distorted by the main α.

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