Tiffany Jansen

@astro_tiff

PhD candidate in astrophysics . Beer drinking, lute playing, game slaying astronomer. Previously: ,

Vrijeme pridruživanja: veljača 2019.

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  1. Prikvačeni tweet
    30. sij

    New paper by me and up on the arxiv today! In this one we measure the occultation depth and phase curve of the ultra-hot Jupiter WASP-100b using data from . And for the first time from a TESS phase curve, we find strong evidence for a windy atmosphere!

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  2. prije 6 sati

    I wonder how well the violinist would perform? Gravity plays such an overlooked role in playing an instrument - my lute stays anchored to my lap so my hands can move freely, for example; gravity pulls the violinist's bow to the fret; etc. Would be cool to experience regardless!

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  3. prije 20 sati

    Remember those terrifying few moments when you had to call your crush's home phone to speak to them but then their mom/dad answered first and you had to ask "hi, um... is ____ home...?" Eeuuugh

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  4. 4. velj
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  5. 2. velj

    People are getting all blown away by how some people don't have an internal dialogue, meanwhile I'm here like WTF y'all are ACTUALLY "talking" with yourselves?? Like having to constantly translate your "thoughts" to words isn't a daily struggle?

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  6. 1. velj
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  7. 1. velj

    Will Brits at least get a national holiday out of this?

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  8. proslijedio/la je Tweet

    I have always been interested in galactic archaeology, but I don't think this is what they meant. Did you know that dinosaurs lived on the other side of the Galaxy?

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  9. 31. sij
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  10. 30. sij

    Raise your hand if your parents have no idea what you're doing but are proud of you anyway

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  11. 30. sij

    Get the deets in our paper here: ! thanks for coming to my TED talk

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  12. 30. sij

    From the phase curve and occultation we also measure its geometric albedo (a measure of reflectivity) to be Ag ~ 0.17, one of the most reflective phase-curve-planets from TESS so far! Here's a barf plot of our posteriors from the fit to the phase curve, def.s of params in paper

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  13. 30. sij

    ... near the end of the paper we discuss if the shifted hot spot could be due to heat released when H molecules (which have been dissociated from H2 on the hot day side) travel via winds to the night side, recombining when temps are cool enough again. More observations needed tho

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  14. 30. sij

    Anyway, such a large hotspot shift is unexpected for ultra-hot Jupiters, which are predicted to reradiate heat much faster than winds can carry hot air to the night side...

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  15. 30. sij

    Another piece of evidence for a warm night side on WASP-100b is that its peak-to-peak phase curve amplitude (~75 ppm) is shallower than its occultation depth (~100 ppm), seen detrended by different methods here.

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  16. 30. sij

    The really interesting bit is that part of this shift is from WASP-100b's atmospheric phase curve (dark blue lines). We measure the hottest longitude to be ~70 degrees east of the substellar point. This is *huge*, and we think its due to winds transporting heat to the night side.

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  17. 30. sij

    Part of this apparent phase shift is due to the star. Because the planet is pretty massive and close to its star, it distorts the star's shape and makes it appear larger from certain points of view - this occurs twice in the orbit and can be seen in light blue in the plot below

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  18. 30. sij

    .. but this is not what we see with WASP-100b! Its brightest point in the TESS waveband occurs prior to its occultation by about 60 degrees, which is a *substantial* phase shift (seen here - the purple lines are samples of our model fit to the data seen in black)

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  19. 30. sij

    If a planet's atmosphere/surface reflects the same in all directions, and the hottest bit is at the longitude pointing right at the star, we would expect a nice symmetric phase curve with its peak amplitude occurring when the planet goes behind the star..

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  20. 30. sij

    When we fold a system's light curve into a function of orbital phase, we can watch the planet wax and wane as it traverses its orbit, reflecting and re-radiating its star’s incident rays. We call this a "phase curve".

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  21. 30. sij

    First, a little bit about WASP-100b: it orbits an F dwarf with a period of about 3 days, has a radius ~50% larger than Jupiter's, is about twice as massive as our friendly neighborhood giant, and one hemisphere likely faces its star at all times. Here's its TESS transit!

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