Oh now THIS is very intriguing! Bernhard and Lloyd with ZTF J185259.31+124955.2: A new evolved disc-eclipsing binary system where the shape of the transit is evolving significantly on every eclipse - look at how much it changes… just wow. 🔭🪐 #astrodonhttps://arxiv.org/abs/2405.15555
@otte_homan A good thought, but moons would be too small to block this light, even if they were orbiting a large planet. This is almost likely a big dusty disk around an unseen companion, and the disk itself is precessing or the orbit of the disk is precessing... or something else again!
Ex-student paper day! Sutlieff et al. (2024) using a gvAPP coronagraph to suppress diffraction from the primary star so that the variability of a faint substellar companion can be measured to 3% precision and a 3.2 hour periodic variability detected one night but disappears the next! 🔭🪐 #astrodonhttps://arxiv.org/abs/2405.12271
As noted by Arttu Sainio it looks as if #ASASSN-24cf is climbing back to pre-eclipse levels - since the ingress and egress look as if they have the same gradient, I’m guessing this is a large, faint star eclipsing a smaller, hotter star. There’s always something interesting in #ASAS-SN 🔭🪐 #astrodonhttps://x.com/space_r2/status/1792696145803976876
Limbach+ on “Occurrence Rates of Exosatellites Orbiting 3-30MJup Hosts from 44 Spitzer Light Curves” with some very intriguing measurements that are suggesting exomoon eclipses around free floating low mass objects and occurrence rates of ~0.6 for short period terrestrial exosatellites 🔭🪐 #astrodonhttps://arxiv.org/abs/2405.08116
Wowsers, we went outside just now in Leiden and you can see red and green auroral bands! They’re faint, but definitely changing on minute timescales! #astrodon#triffids
Deal and Espinoza present Spelunker: A quick-look Python pipeline for JWST NIRISS FGS Guide Star Data - I love astronomy projects which open up new science from previously unconsidered data streams: it will be very interesting to see what someone discovers with this #JWST data. 🔭🪐 #astrodonhttps://arxiv.org/abs/2405.05453
Student paper day! Kleisioti+ on “Direct detectability of tidally heated exomoons by photometric orbital modulation” where she shows that a tidally locked #exomoon with a volcano can be detected with #JWST and two IR bands, even if it’s NOT transiting its parent exoplanet 🔭🪐 #astrodonhttps://arxiv.org/abs/2405.01970
Tschudi+ on SPHERE RefPlanets: Search for epsilon Eridani b and warm dust with an absolutely heroic 38.5 hour cumulative integration looking for reflected light from the RV detected planet 🔭🪐 around this nearby star, but no joy, even with nearly eight decades of sensitivity at 1 arcsec! #astrodonhttps://arxiv.org/abs/2404.19504
In my astronomy career I have had my foot run over by Stephen Hawking, had Neil deGrasse Tyson come to my seminar and promptly fall asleep, and stood in an elevator with Roger Penrose where he was wearing exactly the same clothing as the publicity poster on the elevator wall behind his shoulder.
Cotton+ have discovered that “Deneb is a Large Amplitude Polarimetric Variable” - it’s very rare that something new is found out about a named star, but this shows that you just never know…very cool! Observations were taken with the HIPPI-2 and PICSARR polarimeters 🔭🪐 #astrodonhttps://arxiv.org/abs/2404.17707