HARPS-N

View previous topic View next topic Go down

HARPS-N

Post by Petr86 on 31st March 2012, 9:49 am

first light: http://www.tng.iac.es/news/2012/03/25/harpsn_fl/

More information:
http://www.nature.com/news/north-set-for-mass-analysis-of-planets-1.10302
https://plone2.unige.ch/HARPS-N/overview

Petr86
Micrometeorite
Micrometeorite

Number of posts : 6
Registration date : 2011-09-08

View user profile

Back to top Go down

Re: HARPS-N

Post by Sirius_Alpha on 31st March 2012, 11:17 am

Excellent news! Very Happy

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3468
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: HARPS-N

Post by Lazarus on 31st March 2012, 11:21 am

Hope they have good luck with this project!
avatar
Lazarus
dG star
dG star

Number of posts : 2822
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: HARPS-N

Post by Galzi on 22nd July 2012, 5:58 am

Official operations starting on August 1st, 2012

https://plone2.unige.ch/HARPS-N/news/official-operations-starting-on-august-1st-2012

Galzi
Planetary Embryo
Planetary Embryo

Number of posts : 86
Age : 31
Location : Venetia et Histria
Registration date : 2012-06-03

View user profile

Back to top Go down

Re: HARPS-N

Post by Galzi on 4th September 2012, 1:57 pm

Lists of GTO targets being pursued by HARPS-N:

Kepler candidates: http://www.tng.iac.es/instruments/harps/data/Kepler_GTO_Targets.txt
Nearby bright stars: http://www.tng.iac.es/instruments/harps/data/RPS_GTO_Targets.txt

Galzi
Planetary Embryo
Planetary Embryo

Number of posts : 86
Age : 31
Location : Venetia et Histria
Registration date : 2012-06-03

View user profile

Back to top Go down

Re: HARPS-N

Post by Lazarus on 4th September 2012, 6:42 pm

Seems to be mainly K dwarfs in the nearby sample, a few relatively well known ones in there (Sigma Draconis, 61 Cygni A/B). As far as I'm aware, HD 3651 is the only known exoplanet host on the list.
avatar
Lazarus
dG star
dG star

Number of posts : 2822
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: HARPS-N

Post by tommi59 on 5th September 2012, 3:25 am

Very good K dwarfs my favorite type stars.I am curious what results it will bring to us.Couple interesting KOI like 157 kepler 11? They want to improve massess for these planets?
avatar
tommi59
Jovian
Jovian

Number of posts : 546
Age : 39
Location : Baile Atha Cliath
Registration date : 2010-07-31

View user profile

Back to top Go down

Re: HARPS-N

Post by Galzi on 12th February 2013, 4:12 pm

Laser Comb installed on HARPS-N:

http://www.tng.iac.es/news/2013/02/08/lasercomb/


Galzi
Planetary Embryo
Planetary Embryo

Number of posts : 86
Age : 31
Location : Venetia et Histria
Registration date : 2012-06-03

View user profile

Back to top Go down

Re: HARPS-N

Post by Lazarus on 3rd April 2013, 3:32 pm

Updated parameters of Qatar-1 (I don't think this one was an April Fool's joke):

The GAPS programme with HARPS-N at TNG. I: Observations of the Rossiter-McLaughlin effect and characterisation of the transiting system Qatar-1
http://arxiv.org/abs/1304.0005
avatar
Lazarus
dG star
dG star

Number of posts : 2822
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: HARPS-N

Post by Lazarus on 29th March 2014, 4:20 am

Esposito et al. "The GAPS Programme with HARPS-N at TNG. III: The retrograde orbit of HAT-P-18b"
http://arxiv.org/abs/1403.6728

One of the few retrograde planets orbiting a cool star.

(Paper II in the series was about the HIP 11952 planetary system, as discussed here)
avatar
Lazarus
dG star
dG star

Number of posts : 2822
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: HARPS-N

Post by Lazarus on 20th April 2016, 2:48 am

Berdiñas et al. "High-cadence spectroscopy of M-dwarfs. I. Analysis of systematic effects in HARPS-N line profile measurements on the bright binary GJ 725A+B"
http://arxiv.org/abs/1604.05312

Uncovers some systematic effects:
The systematic effects seem to be related to flux loses due to imperfect corrections of chromatic effects introduced by the Earth’s atmosphere at the telescope-fibre interface. This suspicion is motivated by several measurements and correlations observed in pre-fibre images of the star compared to a number of measurements on the spectrum, most notably changes in the slope of the measured SED. The comparison of measurements between the two stars (and their almost identical systematic behaviour) shows beyond reasonable doubt that the significant variability observed with high-cadence on M-dwarfs has an instrumental origin. While most variability in the width of the line profile is likely to be caused by the algorithms used, smaller residual RV variability remains unexplained.

There are also hints of a ~1.2 Earth mass planet around GJ 725B (a.k.a. Struve/Σ 2398 B) but needs more follow-up observations to confirm whether the signal is periodic.
avatar
Lazarus
dG star
dG star

Number of posts : 2822
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: HARPS-N

Post by Shellface on 20th April 2016, 4:42 pm

The authors speak of similar issues with HARPS-ESO. Fortunately, the effects are not severe and appear to be mostly addressable, so this should not have a serious impact on HARPS-N's performance.

The RV variability of B is of clear interest. The p-value for false alarm they give is vanishingly small, but their lack of time resolution is essentially the limiting factor. It is quite likely a planetary signal (stellar variability is unlikely for such a period, and systematics appear to be ruled out), but it will take many more nights of observation to bring a confident solution.

Shellface
Neptune-Mass
Neptune-Mass

Number of posts : 282
Location : g2 17.∞ 997 t
Registration date : 2013-02-14

View user profile

Back to top Go down

Re: HARPS-N

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum