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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://aus.social/users/CosmicRami/statuses/111615308060770990">CosmicRami (cosmicrami@aus.social)'s status on Thursday, 21-Dec-2023 08:42:23 JST</a><a href="https://aus.social/@CosmicRami" title="cosmicrami@aus.social"><img src="https://gnusocial.jp/avatar/140581-48-20230629061714.webp" width="48" height="48" alt="CosmicRami" style="position: absolute; left: 0; top: 0;">CosmicRami</a></section><article><p>OTD in 2020, Jupiter &amp; Saturn came into conjunction (closest since 1643). MeerKAT (radio interferometer in South Africa) also turned its gaze towards the planets to observe their radio emissions. </p><p>They serendipitously discovered a pulsar in the background!</p><p>Here in the first inset, you can see Jupiter (which is a bright radio source in our sky), as well as Saturn (annotated 'S' - note that it is not as bright a radio source as Jupiter) and the pulsar (annoyed 'P' which stands for pulsar with anomalous refraction recurring on odd timescales - PARROT).</p><p>Also (last two insets), can we all appreciate how incredible Jupiter looks in radio with MeerKAT 𝐵-field vectors overplotted? Radiation belts FTW! </p><p>Oh, and those other sources - they aren't stars ... they are all supermassive black holes in distant galaxies in the background! (look at those jets!)</p><p>📸  <a href="https://arxiv.org/abs/2312.12165" rel="nofollow noreferrer">https://arxiv.org/abs/2312.12165</a> </p><p><a href="https://aus.social/tags/Planets" rel="tag">#Planets</a> <a href="https://aus.social/tags/SolarSystem" rel="tag">#SolarSystem</a> <a href="https://aus.social/tags/RadioAstronomy" rel="tag">#RadioAstronomy</a> <a href="https://aus.social/tags/Astrodon" rel="tag">#Astrodon</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/2479793#notice-4906894">In conversation</a><time datetime="2023-12-21T08:42:23+09:00" title="Thursday, 21-Dec-2023 08:42:23 JST">Thursday, 21-Dec-2023 08:42:23 JST</time> <span>from <span><a href="https://aus.social/@CosmicRami/111615308060770990" rel="external" title="Sent from aus.social via ActivityPub">aus.social</a></span></span><a href="https://aus.social/@CosmicRami/111615308060770990">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/1995868">A radio wavelength image of the sky that several bright blobs in the center, and more scattered points of light and blobs scattered in the background. The central blobs are multi coloured and represent Jupiter and Saturn. There are three insets showing the very central image of the region which are zoomed in on Jupiter, Jupiter, Saturn and the Pulsar and a timeseries motion image of the same region.</a></label><br><a href="https://mediacdn.aus.social/media_attachments/files/111/615/300/791/881/637/original/baf9d8c0a4d1ee60.png" rel="external">https://mediacdn.aus.social/media_attachments/files/111/615/300/791/881/637/original/baf9d8c0a4d1ee60.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/1995869">zoomed in image of the centre region of a large radio image created by MeerKAT. It shows several colour coded blobs of light, with the bottom one being largest and brightest (Jupiter). Two smaller blobs are annotated with an S and a P.</a></label><br><a href="https://mediacdn.aus.social/media_attachments/files/111/615/302/723/384/413/original/67db205f0bbb7d23.png" rel="external">https://mediacdn.aus.social/media_attachments/files/111/615/302/723/384/413/original/67db205f0bbb7d23.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/1995870">An horizontal figure eight shaped blob of multicoloured light with vector arrows indicating the magnetic field of the planet Jupiter.</a></label><br><a href="https://mediacdn.aus.social/media_attachments/files/111/615/304/987/270/563/original/899ba64cfb2e59cf.png" rel="external">https://mediacdn.aus.social/media_attachments/files/111/615/304/987/270/563/original/899ba64cfb2e59cf.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/1995871">radio image showing small white blobs of light and point like structures representing radio emissions from distant galaxies.</a></label><br><a href="https://mediacdn.aus.social/media_attachments/files/111/615/306/978/629/678/original/3d04ce3c1523e36d.png" rel="external">https://mediacdn.aus.social/media_attachments/files/111/615/306/978/629/678/original/3d04ce3c1523e36d.png</a></li><li><article><header><div>Domain not in remote thumbnail source whitelist: arxiv.org</div><h5><a href="https://arxiv.org/abs/2312.12165">The RATT PARROT: serendipitous discovery of a peculiarly scintillating pulsar in MeerKAT imaging observations of the Great Saturn-Jupiter Conjunction of 2020. I. Dynamic imaging and data analysis</a></h5><div></div></header><div>We report on a radiopolarimetric observation of the Saturn-Jupiter Great Conjunction of 2020 using the MeerKAT L-band system, initially carried out for science verification purposes, which yielded a serendipitous discovery of a pulsar. The radiation belts of Jupiter are very bright and time variable: coupled with the sensitivity of MeerKAT, this necessitated development of dynamic imaging techniques, reported on in this work. We present a deep radio "movie" revealing Jupiter's rotating magnetosphere, a radio detection of Callisto, and numerous background radio galaxies. We also detect a bright radio transient in close vicinity to Saturn, lasting approximately 45 minutes. Follow-up deep imaging observations confirmed this as a faint compact variable radio source, and yielded detections of pulsed emission by the commensal MeerTRAP search engine, establishing the object's nature as a radio emitting neutron star, designated PSR J2009-2026. A further observation combining deep imaging with the PTUSE pulsar backend measured detailed dynamic spectra for the object. While qualitatively consistent with scintillation, the magnitude of the magnification events and the characteristic timescales are odd. We are tentatively designating this object a pulsar with anomalous refraction recurring on odd timescales (PARROT). As part of this investigation, we present a pipeline for detection of variable sources in imaging data, with dynamic spectra and lightcurves as the products, and compare dynamic spectra obtained from visibility data with those yielded by PTUSE. We discuss MeerKAT's capabilities and prospects for detecting more of such transients and variables.</div><footer></footer></article></li></ol></footer></blockquote>

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CosmicRami (cosmicrami@aus.social)'s status on Thursday, 21-Dec-2023 08:42:23 JST CosmicRami
OTD in 2020, Jupiter & Saturn came into conjunction (closest since 1643). MeerKAT (radio interferometer in South Africa) also turned its gaze towards the planets to observe their radio emissions.
They serendipitously discovered a pulsar in the background!
Here in the first inset, you can see Jupiter (which is a bright radio source in our sky), as well as Saturn (annotated 'S' - note that it is not as bright a radio source as Jupiter) and the pulsar (annoyed 'P' which stands for pulsar with anomalous refraction recurring on odd timescales - PARROT).
Also (last two insets), can we all appreciate how incredible Jupiter looks in radio with MeerKAT 𝐵-field vectors overplotted? Radiation belts FTW!
Oh, and those other sources - they aren't stars ... they are all supermassive black holes in distant galaxies in the background! (look at those jets!)
📸 https://arxiv.org/abs/2312.12165
#Planets #SolarSystem #RadioAstronomy #Astrodon
In conversationThursday, 21-Dec-2023 08:42:23 JST from aus.socialpermalink
Attachments
1. A radio wavelength image of the sky that several bright blobs in the center, and more scattered points of light and blobs scattered in the background. The central blobs are multi coloured and represent Jupiter and Saturn. There are three insets showing the very central image of the region which are zoomed in on Jupiter, Jupiter, Saturn and the Pulsar and a timeseries motion image of the same region.
  https://mediacdn.aus.social/media_attachments/files/111/615/300/791/881/637/original/baf9d8c0a4d1ee60.png
2. zoomed in image of the centre region of a large radio image created by MeerKAT. It shows several colour coded blobs of light, with the bottom one being largest and brightest (Jupiter). Two smaller blobs are annotated with an S and a P.
  https://mediacdn.aus.social/media_attachments/files/111/615/302/723/384/413/original/67db205f0bbb7d23.png
3. An horizontal figure eight shaped blob of multicoloured light with vector arrows indicating the magnetic field of the planet Jupiter.
  https://mediacdn.aus.social/media_attachments/files/111/615/304/987/270/563/original/899ba64cfb2e59cf.png
4. radio image showing small white blobs of light and point like structures representing radio emissions from distant galaxies.
  https://mediacdn.aus.social/media_attachments/files/111/615/306/978/629/678/original/3d04ce3c1523e36d.png
5. Domain not in remote thumbnail source whitelist: arxiv.org
  The RATT PARROT: serendipitous discovery of a peculiarly scintillating pulsar in MeerKAT imaging observations of the Great Saturn-Jupiter Conjunction of 2020. I. Dynamic imaging and data analysis
  We report on a radiopolarimetric observation of the Saturn-Jupiter Great Conjunction of 2020 using the MeerKAT L-band system, initially carried out for science verification purposes, which yielded a serendipitous discovery of a pulsar. The radiation belts of Jupiter are very bright and time variable: coupled with the sensitivity of MeerKAT, this necessitated development of dynamic imaging techniques, reported on in this work. We present a deep radio "movie" revealing Jupiter's rotating magnetosphere, a radio detection of Callisto, and numerous background radio galaxies. We also detect a bright radio transient in close vicinity to Saturn, lasting approximately 45 minutes. Follow-up deep imaging observations confirmed this as a faint compact variable radio source, and yielded detections of pulsed emission by the commensal MeerTRAP search engine, establishing the object's nature as a radio emitting neutron star, designated PSR J2009-2026. A further observation combining deep imaging with the PTUSE pulsar backend measured detailed dynamic spectra for the object. While qualitatively consistent with scintillation, the magnitude of the magnification events and the characteristic timescales are odd. We are tentatively designating this object a pulsar with anomalous refraction recurring on odd timescales (PARROT). As part of this investigation, we present a pipeline for detection of variable sources in imaging data, with dynamic spectra and lightcurves as the products, and compare dynamic spectra obtained from visibility data with those yielded by PTUSE. We discuss MeerKAT's capabilities and prospects for detecting more of such transients and variables.

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