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Kevin Hardegree-Ullman
@
kevinkhu
Pasadena, CA
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Exoplanets, cool stars, brown dwarfs. He/him/his.
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903
Tweetovi
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268
Pratim
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270
Osobe koje vas prate
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Kevin Hardegree-Ullman
@kevinkhu
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4 h |
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The orbital periods range between 4 hours and 80 (Earth) days. Planets appear to form at all distances to their host star, and there is no correlation between the gap and orbital period.
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Kevin Hardegree-Ullman
@kevinkhu
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19 h |
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Astronomers believe planet formation is complete and solar systems don't change much by ~100 million years after the star forms. Most of these planets are around stars that are billions of years old. There are currently very few planets known around very young stars.
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Kevin Hardegree-Ullman
@kevinkhu
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20 h |
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And were interviewed by Scientific American: scientificamerican.com/article/clara-…
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Kevin Hardegree-Ullman
@kevinkhu
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20 h |
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The science advisors wrote a research note: iopscience.iop.org/article/10.384…
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Kevin Hardegree-Ullman
@kevinkhu
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24 h |
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This is plot 16 of the paper. There are definitely other plots that are more representative of the overall scientific results of the paper, but I understand automated systems have some pitfalls.
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Kevin Hardegree-Ullman
@kevinkhu
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4. velj |
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Orphan 55 😂
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Kevin Hardegree-Ullman
@kevinkhu
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4. velj |
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Odds are higher if "Planck used a Gaussian process in their Bayesian technique to model the Rayleigh scattering slope of the atmosphere." 🤯
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Kevin Hardegree-Ullman
@kevinkhu
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4. velj |
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If someone said out loud "the homogeneous analysis provided updated ephemerides and eccentricities for the exoplanet systems," there's a 150% probability of my head exploding. 🙄 twitter.com/asrivkin/statu…
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Kevin Hardegree-Ullman
@kevinkhu
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4. velj |
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I'm not sure how @arXiver selects the plot to tweet, but this one highlights that you should definitely be careful with Gaia temperatures! twitter.com/arXiver/status…
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Ethan Kruse
@ethan_kruse
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3. velj |
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Any undergrads want a paid summer internship at @NASAGoddard? Our group is looking for 5 awesome people to help us find and study planets with TESS.
I can nearly guarantee you'll discover a new exoplanet if you want to work on the search side! It's a thrill that never fades!
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Jon Zink
@jonKzink
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3. velj |
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I have a new paper out today!
"Scaling K2. II. Assembly of a Fully Automated C5 Planet Candidate Catalog Using EDI-Vetter"
arxiv.org/abs/2001.11515
The first fully automated analysis of transiting K2 exoplanets. pic.twitter.com/FqYtmGPVE3
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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Absolutely. I think K dwarfs are probably the best kept open secret in exoplanets. Probably a poor choice to down-weight for TESS.
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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It appears to be an artifact of the random forest. Few LAMOST targets were <3500K and fainter than M_K=6, so it probably latched onto mostly warmer and sometimes brighter targets. There's definitely room for improvement on the photometric M dwarf Teffs.
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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Does this count as a #SuperBowl? twitter.com/kevinkhu/statu…
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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K2 Planet Occurrence Rates, here we come... pic.twitter.com/wGCqZ8VHy8
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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BUT WAIT.... THERE'S MORE!
Go read "Scaling K2. II. Assembly of a Fully Automated C5 Planet Candidate Catalog Using EDI-Vetter", led by @jonKzink!
arxiv.org/abs/2001.11515 pic.twitter.com/I2nEfPQjmf
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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Many thanks to @jonKzink, @aussiastronomer, @AstroDressing, David R. Ciardi, and @JoshuaSchlieder for their important contributions to this paper! pic.twitter.com/Tl9tmNSHyD
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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This result would not have been easily identifiable without a uniform set of stellar parameters. pic.twitter.com/nw5qHdkTsB
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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This means that the Kepler result is not a fluke, and since K2 probes different regions in the Galaxy, this result is not exclusive to the Kepler field!
Here's how the radius valley looks in relation to incident stellar flux (left), and compared Kepler (right). pic.twitter.com/zN5ka4wilO
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Kevin Hardegree-Ullman
@kevinkhu
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3. velj |
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Using our new stellar parameters, we re-derived radii for 299 confirmed and 517 candidate planets and something magical happened: WE FOUND A DEFINITIVE PLANET RADIUS GAP FOR THE FIRST TIME IN A DATA SET OTHER THAN KEPLER! pic.twitter.com/IAlZkHbJhx
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