ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

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bystander
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ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby bystander » Wed Dec 06, 2017 3:32 pm

First Light for ESPRESSO — the Next Generation Planet Hunter
ESO Organisation Release | ESPRESSO | 2017 Dec 06

The Echelle SPectrograph for Rocky Exoplanet and Stable Spectroscopic Observations (ESPRESSO) has successfully made its first observations. Installed on ESO’s Very Large Telescope (VLT) in Chile, ESPRESSO will search for exoplanets with unprecedented precision by looking at the minuscule changes in the light of their host stars. For the first time ever, an instrument will be able to sum up the light from all four VLT telescopes and achieve the light collecting power of a 16-metre telescope.

ESPRESSO has achieved first light on ESO’s Very Large Telescope at the Paranal Observatory in northern Chile [1]. This new, third-generation echelle spectrograph is the successor to ESO’s hugely successful HARPS instrument at the La Silla Observatory. HARPS can attain a precision of around one metre per second in velocity measurements, whereas ESPRESSO aims to achieve a precision of just a few centimetres per second, due to advances in technology and its placement on a much bigger telescope. ...

ESPRESSO can detect tiny changes in the spectra of stars as a planet orbits. This radial velocity method works because a planet’s gravitational pull influences its host star, causing it to “wobble” slightly. The less massive the planet, the smaller the wobble, and so for rocky and possibly life-bearing exoplanets to be detected, an instrument with very high precision is required. With this method, ESPRESSO will be able to detect some of the lightest planets ever found [2].

The test observations included observations of stars and known planetary systems. Comparisons with existing HARPS data showed that ESPRESSO can obtain similar quality data with dramatically less exposure time. ...
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Re: ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby neufer » Wed Dec 06, 2017 5:55 pm

bystander wrote:First Light for ESPRESSO — the Next Generation Planet Hunter
ESO Organisation Release | ESPRESSO | 2017 Dec 06
ESPRESSO has achieved first light on ESO’s Very Large Telescope at the Paranal Observatory in northern Chile [1]. This new, third-generation echelle spectrograph is the successor to ESO’s hugely successful HARPS instrument at the La Silla Observatory. HARPS can attain a precision of around one metre per second in velocity measurements, whereas ESPRESSO aims to achieve a precision of just a few centimetres per second, due to advances in technology and its placement on a much bigger telescope. ...

    For reference: The Earth orbits at 2,978,000 cm/s so the
    (333,000 Earth mass) Sun must travel ~9 cm/s in the opposite direction
Art Neuendorffer

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Re: ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby MargaritaMc » Wed Dec 06, 2017 6:31 pm

neufer wrote:
    For reference: The Earth orbits at 2,978,000 cm/s so the
    (333,000 Earth mass) Sun must travel ~9 cm/s in the opposite direction

Thanks Art, that is most helpful.
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Re: ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby BDanielMayfield » Thu Dec 07, 2017 7:03 am

MargaritaMc wrote:
neufer wrote:
    For reference: The Earth orbits at 2,978,000 cm/s so the
    (333,000 Earth mass) Sun must travel ~9 cm/s in the opposite direction

Thanks Art, that is most helpful.


Ditto. saved me from doing the math myself.
"Happy are the peaceable ... "

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Re: ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby MargaritaMc » Sat Dec 09, 2017 6:30 pm

BDanielMayfield wrote:
Ditto. saved me from doing the math myself.

I'm embarrassed to admit that I can't remember how to do this particular calculation (I think that I once knew, but the elderly brain is getting slow and rusty), so I'd be very grateful if someone would give the equation needed. And possibly explain the physics?

Many thanks.
Margarita
"In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
— Dr Debra M. Elmegreen, Fellow of the AAAS

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Re: ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby neufer » Sat Dec 09, 2017 7:31 pm

MargaritaMc wrote:
I'm embarrassed to admit that I can't remember how to do this particular calculation (I think that I once knew, but the elderly brain is getting slow and rusty), so I'd be very grateful if someone would give the equation needed. And possibly explain the physics?

Momentum of the Earth = ME x VE = ME x ~3,000,000 cm/s = 3,000,000 ME cm/s
Momentum of the Sun = MS x VS = 333,000 ME x ~(-9 cm/s) = -3,000,000 ME cm/s

Law III: To every action there is always opposed an equal reaction:
or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
Art Neuendorffer

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Re: ESO: First Light for ESPRESSO — the Next Generation Planet Hunter

Postby MargaritaMc » Mon Dec 11, 2017 11:34 am

neufer wrote:
MargaritaMc wrote:
I'm embarrassed to admit that I can't remember how to do this particular calculation (I think that I once knew, but the elderly brain is getting slow and rusty), so I'd be very grateful if someone would give the equation needed. And possibly explain the physics?

Momentum of the Earth = ME x VE = ME x ~3,000,000 cm/s = 3,000,000 ME cm/s
Momentum of the Sun = MS x VS = 333,000 ME x ~(-9 cm/s) = -3,000,000 ME cm/s

Law III: To every action there is always opposed an equal reaction:
or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.


Thank you VERY MUCH INDEED, Art! I really appreciate your help. :thumb_up:
"In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
— Dr Debra M. Elmegreen, Fellow of the AAAS


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