Tag: astronomy

Mapping the surface of an extrasolar planet light years away.

8:05 am

Mapping the surface of an extrasolar planet light years away. From the paper’s abstract [pdf]:

We use archived Spitzer [Space Telescope] data of [the star] HD189733 … encompassing six transits, eight secondary eclipses, and a phase curve in a two-step analysis. The first step derives the planet-star system parameters. The second step investigates the structure found in eclipse scanning, using the previous planet-star system parameter derivation as Gaussian priors.

We find a 5-sigma deviation from the expected occultation ingress/egress shape for a uniform brightness disk, and demonstrate that this is dominated by large-scale brightness structure and not an occultation timing offset due to a non-zero eccentricity. Our analysis yields a 2D brightness temperature distribution showing a large-scale asymmetric hot spot whose finer structure is limited by the data quality and planet orbit geometry. [emphasis mine]

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Ed Weiler quit NASA over Mars planetary program cuts to be announced Monday

12:53 pm

Ed Weiler quit NASA in September because of the cuts to the Mars planetary program that the Obama administration will announce on Monday.

Weiler was NASA’s chief science administrator for most of the past thirty years.

As I have already noted, the programs that NASA shouldn’t cut are its planetary and astronomy programs. Far better to dump the Space Launch System, which eats up a lot more cash and will end up producing nothing. By doing so you would not only reduce NASA’s actual budget — thereby saving the federal government money — you could simultaneously increase the budgets of the planetary and astronomy programs.

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Another superEarth has been found orbiting a star in the habitable zone.

5:31 pm

Another superEarth has been found orbiting a star in the habitable zone.

An M-class dwarf star called GJ 667C, which is 22 light-years away from Earth, had previously been observed to have a super-Earth (called GJ 667Cb) that orbited the star in only 7.2 days, making it too close to the star, and thus too hot, to support life.

The study started with the aim of learning more about the orbit of GJ 667Cb. But the research team found a clear signal of a new planet (GJ 667Cc) with an orbital period of 28.15 days and a minimum mass of 4.5 times that of Earth.

Though the planet is much closer to its star than the Earth, the star itself is much smaller and dimmer, so overall the planet gets about the same amount of energy as the Earth.

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The face in space

3:38 pm

The face in space.

The hotbed of star birth, called NGC 3324, is full of hot young stars, whose ultraviolet radiation is making the gas clouds glow. The stellar wind and radiation from the newborn stars has also punched out a cavity in the surrounding gas and dust. The edge of the wall of gas and dust at the right in the photo resembles the profile of a human face, with a ridge in the center that looks like a nose.

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A new superconducting detector might supersede CCDs for astronomy

11:27 am

Good news: A new superconducting detector might supersede CCDs for large astronomical telescopes.

Ben Mazin, an astronomer at the University of California, Santa Barbara, believes that he is on the cusp of a camera breakthrough: his lab is working on a superconducting detector that could eventually replace the charge-coupled devices (CCDs) that have become de rigueur in both consumer and astronomical digital cameras. Mazin’s detectors, known as microwave kinetic inductance detectors (MKIDs), can simultaneously count photons, measure their energy and record each one’s time of arrival — something that CCDs can do only after the light is split with a prism or a grating, an extra step that adds to the loss of photons.

And you know that inevitably some variation of this technology is going to find its way into ordinary commercial products.

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