Spectroscopic madness

ResearchBlogging.org

The BBC is currently running a 3-part series called BBC Stargazing, hosted by Brian Cox and Dara O Briain. The last episode aired last night, sadly I didn’t have access from here in Germany. There’s lots of discussion and enthusiasm on twitter with the #BBCstargazing hashtag, and not just from the regular crowd of astronomers I follow. Combined with the partial solar eclipse visible from these parts this week, it’s a great week for getting people excited about the skies.

It made me think back fondly to 2003, when I took 6 weeks out of my PhD to work on a BBC programme called All Night Star Party, filmed at Jodrell Bank and on La Palma. A great experience, where I met lots of (weird &) wonderful people – including, briefly, Brian Cox, who was a guest on the programme – from both professional and amateur communities, and from the media.

For those who have mastered the stargazing skill, know their way around the night sky and want to take things further, a paper on astro-ph yesterday talks about the growing community of amateur astronomers who use commercial off-the-shelf spectroscopic instruments with their telescopes to do some cool science. The paper, presented by Thomas Eversberg of the self-founded Schnörringen Telescope Science Institute near Cologne at a conference on “Stellar winds in Interaction” in 2010, describes some of the spectrographs that are currently available to the amateur community and what they can be used for.

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First steps in direct exoplanet spectroscopy

Top: Image of star HR8799 and its exoplanet HR8799c (ESO/M.Janson). Bottom: The spectrum as recorded by the NACO detector, prior to extraction ; the vertical direction is spatial, horizontal is spectral (M. Janson et al, 2010)

ResearchBlogging.org

Astronomers collaborating from both sides of the Atlantic have obtained the first direct spectrum of an exoplanet. The news here is mainly that they managed to record the spectrum and separate it reliably from that of the host star. Their short letter in ApJ, posted to astro-ph yesterday, doesn’t delve deeply into the implications of what they found but focuses more on the way they obtained, processed and analysed their data to separate the planet’s signature from that of the star.

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