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23 December 2021The upcoming 3rd Gaia Data Release (Gaia DR3) will introduce for the first time BP/RP mean spectra in the wide range of Gaia data products. The exact number of sources for which BP/RP mean spectra will be published is still undefined but it is expected to be of the order of 100 million. The vast majority of these sources will be brighter than...
22 December 2021On October 7, 2021, The Lucky Star team at Observatoire de Paris (France) led and organised the largest occultation and imaging campaign by the Neptunian system ever undertaken since the Voyager flyby in 1989. This occultation event was observable across the Americas (North, Central, and South) as well as in Hawaii, and the campaign involved all...
1 December 2021By combining data from different surveys and organising follow-up observations of selected candidates, a team of researchers has observed a new type of binary star that was long predicted to exist. The discovery finally confirms how such a rare type of star in the universe forms and evolves. The results have been described in Monthly Notices of...
24 September 2021Gaia16aye was a binary microlensing event detected by Gaia in 2016 as one of the first transients of that kind reported by Gaia Photometric Science Alerts (Hodgkin et al. 2021). The event has been followed-up from the ground by a network of telescopes over the period of two years (see our image of the week story of october 2016 and the story...
22 September 2021Looking up from Earth, the stars we see are shown on the canvas of the sky in two dimensions. Though stars or constellations may appear to be close to one another, appearances can be deceiving. With the parallax measurements from Gaia a third dimension is available. Knowing the parallax of a star allows to deduce its distance, which truly allows...
16 September 2021Everyone working in the DPAC or using the Gaia results knows how much mathematic modelling and computer science take place behind the stage to transform the dull raw material delivered by the telescopes into an incredible epoch-making catalogue. In this story one shows that with only simple arithmetic, repeated additions (admittedly nearly 180...
25 August 2021Motivated by the recent developments in multi-messenger astronomy, and in particular the detection of an electro-magnetic counterpart to the gravitational wave (GW) event GW170817, and by the non-detections of subsequent GW events involving at least one neutron star, a contribution from Gaia to this emerging field has been discussed.
9 July 2021Gaia RVS stellar spectra, at a resolution of ~11500, contain a wealth of information about Milky Way stars. This animation shows several Gaia RVS stellar spectra, presenting the stellar flux (black dots) in the wavelength interval between 846 and 870 nm (in vacuum). The flux is normalized to the continuum, showing variations (spectral lines) due...
23 June 2021The Gaia data releases contain a wealth of astrophysical data on about 1.8 billion stars in our Milky Way and beyond. The creation of these data releases is in the hands of the Gaia Data Processing and Analysis Consortium, Gaia DPAC, which has itself organised in 9 Coordination Units with help from 6 Data Processing Centres. Each coordination...
27 April 2021In 2015, after one year of data acquisition by Gaia, we reported the case of HIP 70674, a well-known double lined spectroscopic binary (SB2), with visual magnitude V=7.99. The aim was to demonstrate the capability of the Coordination Unit 6 (CU6) Single Transit Analysis (STA) pipeline to measure radial velocities from double lined spectra as...
30 March 2021Gaia is sampling more than a billion Milky-Way stars at a mean rate of 15 times per year. The Gaia scanning law was optimised for obtaining precise astrometry and is therefore not optimal for detecting planets that transit periodically the disk of their host stars. Nevertheless, this type of events can in principle be seen in the Gaia data. In...
26 March 2021Well before Gaia published its first astrometric releases, its promising impact for observing stellar occultations by a variety of bodies of the Solar System was thrilling. Those expectations were fully met, and a recent breakthrough shows that reality even surpassed our prospects. On 7 March 2021, and for the first time ever, the occultation of...
26 February 2021While the scientific community is analysing the first batch of the Gaia DR3 data, part of the Data Processing and Analysis Consortium (DPAC) is already engaged in the production of Data Release 4. The Intermediate Data Update (IDU) pipeline and the Data Processing Centre of Barcelona delivered the results of the first cross-match run in...
