We’re back with a session on planets around white dwarfs 🪐
Ryan MacDonald reminds us that in a very long time this will be the fate of our sun too. Jupiter and Saturn will probably fine but closer in… nah likely not.
This is basically what we can test by looking at white dwarf planetary systems. Killing planets in this way means there are polluted white dwarfs with planetary material in their stellar atmosphere. But for the ones that survive we can do a study of what could be.
For the last talk of today, we’ve got Tim Cunningham on accreted planetary material determined from #xray observations.
Tim starts with the #exoplanet#HR diagram and points out polluted white dwarfs. Roughly 25-50% of the WD we know show metal pollution. This is expected to be happening when the star dies and kills its planetary system + then accretes the planetary material.
The accretion rates depend on the atmospheric models of WDs. #ExSSV
Did you do a spectral fit, and it converged, but it left you unsatisfied with its quality? Think it could have done better, but you can't justify pushing the model any further because the χ² is apparently "good enough"? Then this recipe, https://iopscience.iop.org/article/10.3847/2515-5172/ad18b5, by @anshumanastro and me is what you are looking for. It lets you analyze trends in the residuals and control systematics, allowing you to access and use information that wasn't used in the χ² minimization.
Well, a positive for the morning. Arm not much better today. Was trying to decide whether to go to the local Emerg at WCGH, the (useless) local clinic, or the Urgent care centre 30min away. The first and last option have imaging... so I decided on seeing how busy Emerg was. Turns out, not at all. Only waited a couple minutes and I'm already done the Xray. We'll see how long I wait for an assessment. #BadArm#HealthCare#BCHealthcare#Canada#Xray#Ultrasound
Got called to see the Dr. at 2:30. XRay was ok. He checked my arm movement and agreed it was a nerve and/or fluid sack in the top of the shoulder. Advil and Tylenol for a couple weeks with heat will hopefully help. Might need physio if it doesn't resolve in a couple weeks or more if it is persistent. Hoping for the best, basically. Ill make an appointment with my family doc which will be in at least three weeks anyway. #BadArm#HealthCare#BCHealthcare#Canada#Xray#Ultrasound
Even when development started in summer '79 it took twice as long as Apple expected, not only because they had to get rid of Jobs first. So LISA wasn't launched earlier than 1983 with 1Mb RAM for almost U$D 10K. The project was a $50 million investment for Apple Inc., and kept losses low since it sold almost 5K units annually. After 27 months it was in-house competition that buried the Lisa computers, litterally. In the end it was a zero sum game for Apple, but a huge step for modern graphic user-interfaces and more personal computers.
Et le soir, quand la folie de la journée s'apaise, dans la clinique silencieuse où je reste seul avec le goutte a goutte des animaux hospitalisés, prendre le temps d'une lecture calme et attentive des radios de bilan d'extension cancéreuses faites ce matin.
Pour enfin appeler le monsieur qui se ronge les ongles a la maison.
Ça c'est la radio par laquelle tout a commencé. Une tumeur qui bouffe le bas du tibia de ce chien de huit ans, venu pour boiterie.
Oui c'est vraiment grave.
L'autre membre postérieur. RAS. Celui ci ne risquait pas grand chose côté métastases mais par contre il va devoir compenser celui qu'on va couper. Donc faut qu'il soit bien !
C'est le cas.
J'ai mis un grossissement : c'est tellement beau la trame osseuse ♥️ #xray
Xray, one of the largest anti-censorship projects, seems to often ignore proposals posted in languages other than Chinese. This should not happen, anti-censorship is not a fight exclusive to the Chinese people.
So I said, fuck you. Either read the non-Chinese issues, or bear with shitty machine translations.
Watch as data from Hubble and the Chandra X-ray Observatory is used to create this 3D visualization of Eta Carinae, one of the most massive stars in our galaxy, known for its “Great Eruption” in the 1840s. Credit: NASA/ESA/STScI.
Here is a special Nature cover for the International #ObserveTheMoon Night!
The first soft X-ray image of the Moon, courtesy of reflected solar X-rays, captured by the ROSAT Satellite. The dark side of the Moon shadows a diffuse cosmic X-ray background.