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Astronomers have used TESS data to find exocomets, probe the atmospheres of planets we already knew about, and most recently to find possible evidence for imminent planetary destruction. It orbits so close to its host star that tidal interactions between the star and planet can cause the shape of orbit to vary over time, giving rise to transit-timing variations, illustrated in the video below. Just this week, Luke Bouma, a graduate student in Princeton astronomy, and colleagues analyzed recent TESS observations of WASP-4b to see if the data show any signs of orbital variations. Not only did they find signs of orbital variation, they found that the orbital period seems to be getting shorter, at a rate of about 12 milliseconds per year, or about one jiffy every year.
The seventh inner moon of Neptune In our research group meeting this week, we discussed the recent discovery of a new moon orbiting Neptune, named after Poseidon’s chimerical winged pega-fish Hippocamp. In fact, Showalter and colleagues had to use high-precision Hubble observations and a new data-processing approach to spot the little moon circling Neptune just interior to another moon Proteus. That same collision may have created Proteus’ enormous impact basin Pharos, and Showalter suggests that collision would have liberated debris, some of which later accreted interior to Proteus’ orbit to form Hippocamp. Based on studies of the frequency of large cometary collisions out near Neptune’s orbit, Showalter and colleagues estimate that Hippocamp may have been disrupted and re-accreted about 9 times in the last 4 billion years.
RT @aaspostdoc : KIAA Postdoctoral Research Position in Quasars and Galaxy Evolution @ KAVLI INSTITUTE FOR ASTRONOMY AND ASTROPHYSICS, PEKIN… RT @aaspostdoc : KIAA Postdoctoral Research Position in Quasars and Galaxy Evolution @ KAVLI INSTITUTE FOR ASTRONOMY AND ASTROPHYSICS, PEKIN… Really interesting story about an ancient Korean princess who had a passion for astronomy - https://t. co/gu81nqf8yp
RT @aaspostdoc : KIAA Postdoctoral Research Position in Quasars and Galaxy Evolution @ KAVLI INSTITUTE FOR ASTRONOMY AND ASTROPHYSICS, PEKIN… RT @aaspostdoc : KIAA Postdoctoral Research Position in Quasars and Galaxy Evolution @ KAVLI INSTITUTE FOR ASTRONOMY AND ASTROPHYSICS, PEKIN… Really interesting story about an ancient Korean princess who had a passion for astronomy - https://t. co/gu81nqf8yp