ObsCore - plans for calib_level in next revision

[Petr Skoda]

> This seems bigger than the topic at hand..

That is the reason I am asking ... The RV time series and crosscorrelation 
function is in fact the most important product of all exoplanetary 
research. For lightcurve we already have solution (IMHO)


> Are you able to post this as an Issue (Enhancement Request) on the ObsCore
> Git Repository <https://github.com/ivoa-std/ObsCore> so we can keep it on
> the radar?
> Mark

I have cloned the source and compiled it - But before going too much  in 
details I need to have a look at the ideas how the visibility curves look 
in practice . The CCF is similar althought there is no FFT applied.

I just started think what should be the o_ucd for it ....The
data product type may be measurement or we need something similar to 
visibility .


calib data level is here clearly 4 aka obscore-analysis (in fact the 
question about calib 
level) sparked my imagination ;-)

But there is a problem that the CCF is obtained with different masks - and 
the masks (usually late type star spectrum) must be somehow referenced....

Until what time should the contributions be put there in obscore TeX in 
order to catch 
the next release ? (I will do some analysis  on it)

Best regards,

Petr


>
>
> On Thu, Jun 12, 2025 at 9:54 AM Petr Skoda <skoda at sunstel.asu.cas.cz> wrote:
>
>> Hi all,
>> just after having seen the presentation of Bruce Berriman about EPRV
>> format I would like to ask for the future embedding of some of its parts
>> into VO. IMHO their L4 data is something which sounds as a good use case
>> for the Obscore - there will be main product of radial velocity (I guess
>> we have UCD for it ) but what about cross-correlation function ... Is
>> there something like this in vocabularies of UCD - IMHO it is like the
>> visibility function and this is I suppose handled by Radio extension.
>>
>> I am sorry for not being following the Obsore changes i recent few years,
>> so I am just guessing .
>>
>> Anyway the TAP query for getting CCF for given target from given
>> observation epoch from multiple instruments is something I can imagine as
>> a request with top science priority in the future when PLATO and Ariel
>> will work. Similar the request for RV curve (radial velocity vs time or
>> folded phase) - this is more for Time domain - aka lightcurves...
>>
>> Petr
>>
>> *************************************************************************
>> *  Petr Skoda                         Phone : +420-323-649201, ext. 361 *
>> *  Stellar Department                         +420-323-620361           *
>> *  Astronomical Institute CAS         Fax   : +420-323-620250           *
>> *  251 65 Ondrejov                    e-mail: skoda at sunstel.asu.cas.cz  *
>> *  Czech Republic                             skoda at asu.cas.cz          *
>> *************************************************************************
>>
>

*************************************************************************
*  Petr Skoda                         Tel   : (323) 649201, l. 361      *
*  Stelarni oddeleni                          (323) 620361              *
*  Astronomicky ustav AVCR, v.v.i     Fax   : (323) 620250              *
*  251 65 Ondrejov                    e-mail: skoda at sunstel.asu.cas.cz  *
*  Ceska republika                                                      *
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