Time Domain DAL/DM/TDIG

Fri Jul 7 13:51:36 CEST 2017

Dear Marco, 

Thanks for your input.

> On 6 Jul 2017, at 14:47, Marco Molinaro <molinaro at oats.inaf.it> wrote:
> 
> Dear Ada,
> dear all,
> 
> regarding the "discovery" item, related to RV Time Series
> in the exoplanets domain, I had a meeting with people
> from the GAPS project.
> (if interested a quick summary can be found here:
> https://www.asterics2020.eu/dokuwiki/doku.php?id=open:wp4:wp4gapsinaf)
> 
> The main point I'd like to alert about here (other parts I think
> are nicely covered by your summary and review) is that a
> discovery for time series when doing research on exoplanets
> requires:
> - host star characterisation, especially stellar activity indexes

Regarding the host star characterisation, I think this is in the lines "query by object type”. 
This is very important not only for exoplanets but for many other scientific cases. 

> - planet(s) ~existence~ and characteristics
>  [and this may be though because 1 stellar system potentially
>  means multiple planets]
I agree with you
> 
> And, vice-versa, searching exoplanets having time series attached
> requires as discovery metadata the search method used (this can be
> a small vocabulary).
> 
> I'll try to work on the star/activity/planets part related to the GAPS
> project, the vice-versa requires other projects with different than
> spectroscopic RV method to join.
> 

There is a list of metadata needed to describe and discover TimeSeries that we came up with during the ASTERICS hackathon meeting, 
summarised by F. Bonnarel in Shanghai. I have rewritten that list under: 
http://wiki.ivoa.net/twiki/bin/view/IVOA/DAL_DM_TDIG_ShanghaiSession2017#Asterics_hackathon_report_F_Bonn <http://wiki.ivoa.net/twiki/bin/view/IVOA/DAL_DM_TDIG_ShanghaiSession2017#Asterics_hackathon_report_F_Bonn>

To my opinion some of the things there are too detailed/complicated, e.g. Fourier coefficients. 
And I think that we can build a restricted list of minimum requirements based on those. 
Please, have a look at the list and let me know among those fields which you think are a must. 

Cheers,
Ada

> Cheers,
>    Marco
> 
> 2017-07-04 13:08 GMT+02:00 AdaNebot <ada.nebot at astro.unistra.fr>:
>> 
>> Dear All,
>> 
>> In Shanghai it was decided that TimeSeries is a scientific priority of the
>> IVOA. Based on the DAL/DM/TDIG session, here is a list of items to be
>> discussed. Please feel free to add any other items you consider relevant to
>> TimeSeries and you would like to discuss:
>> 
>> What is TimeSeries data? It is a temporal sequence of measurements
>> containing a time coordinate and a flux (or similar - magnitude) / RV /
>> position / polarisation / number of spots / spectra / images. Light-curves
>> and RV curves dominate the landscape of TimeSeries.
>> Concerning DM: there are models that work for representation of some of the
>> science cases proposed by the SPC.
>> 
>> Modified SpectrumDM works fine for light curves with some modifications.
>> The draft TimeSeriesCube serialisation examples work with SPLAT. But there’s
>> still some discussion needed on the model.
>> Feedback from people who have tried both models is appreciated in this
>> respect.
>> Although light-curves and RV curves dominate the landscape of TimeSeries,
>> for which a modified version of SpectrumDM (or a similar for RVs) would
>> work, we should have an extensible model towards other kind of data, perhaps
>> built as a simple derivation/specialization of the SparseCube DM.
>> 
>> Discovery: Obscore/EpnCore + TAP could work if the time axis information
>> would be extended. What are the minimum mandatory fields for TimeSeries data
>> to be found by the user? For that collecting science cases is important. A
>> set of minimum data has already been compiled during an ASTERICS meeting.
>> Different communities need to be properly represented. Attending to
>> astronomy meetings is important to hear the astro-community. See the series
>> of meetings under:
>> http://wiki.ivoa.net/twiki/bin/view/IVOA/IvoaVOEvent#Future_Events. Please
>> if you plan to attend any of these meetings or any other related Time Domain
>> meeting it would be useful to know it and to post it on the wiki.
>> Format: Time has to be properly formatted to combine data coming from
>> different surveys. See email from A. Rots (19 May 2017) sent to DM, DAL and
>> TDIG + reference A&A 574, 36 (2015).
>> 
>> To keep track these items will be posted on the TDIG wiki, under the
>> TimeSeries section:
>> http://wiki.ivoa.net/twiki/bin/view/IVOA/IvoaVOEvent#Time_Series_Data
>> 
>> In particular under: http://wiki.ivoa.net/twiki/bin/view/IVOA/DAL_DM_TDIG I
>> have already written these four items.
>> 
>> You can also find a summary of the different contributions in the
>> DAL/DM/TDIG Shanghai session under:
>> http://wiki.ivoa.net/twiki/bin/view/IVOA/DAL_DM_TDIG_ShanghaiSession2017
>> 
>> The intention of this email is to start productive discussions on each
>> topic.
>> 
>> Thanks!
>> Ada

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