A5018180176- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical and nuclear sciences
- History and Developments in Astronomy
- Satellite Communication Systems
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Radioactive Decay and Measurement Techniques
- Mediterranean and Iberian flora and fauna
- Environmental and Cultural Studies in Latin America and Beyond
- Historical Studies on Spain
- Molecular Spectroscopy and Structure
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
Universidad Nacional Autónoma de México
2008-2023
Universidad Autónoma de Baja California
2023
Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy1. Current orbiting constellation have brightnesses between apparent magnitudes 4 and 6, whereas the near-infrared Ks band, they can reach magnitude 2 (ref. 2). Satellite operators, astronomers other users night sky are working on brightness mitigation strategies3,4. Radio emissions induce further potential risk radio telescopes that also need be evaluated. Here we...
Large sub-Neptunes are uncommon around the coolest stars in Galaxy and rarer still those that metal-poor. However, owing to large planet-to-star radius ratio, these planets highly suitable for atmospheric study via transmission spectroscopy infrared, such as with JWST. Here we report discovery validation of a sub-Neptune orbiting thick-disk, mid-M dwarf star TOI-2406. We first infer properties host by analysing star's near-infrared spectrum, spectral energy distribution, Gaia parallax. use...
Me 2-1 is a high-excitation planetary nebula whose morphology and physical structure have not yet been investigated. We present narrow-band images in several emission lines, high- intermediate-resolution long-slit spectra aimed at investigating its 3D structure, parameters chemical abundances. By applying deconvolution techniques to the images, we identified 2-1: an elliptical ring; two elongated, curved structures (caps) that contain three pairs of bright point-symmetric (PS) knots; shell...
We have carried out continuum and line polarisation observations of two Proto-planetary nebulae (PPNe), CRL 618 OH 231.8+4.2, using the Submillimeter Array (SMA) in its compact configuration. The frequency range observations, 330-345 GHz, includes CO(J=3-2) emission. 231.8+4.2 show quadrupolar bipolar optical lobes, respectively, surrounded by a dusty envelope reminiscent their AGB phase. report detection dust polarised emission both PPNe above 4 sigma but no molecular 3 limit. is slightly...
We present narrow-band Halpha and [OIII] images, high-resolution, long-slit spectra of the planetary nebulae (PNe) Abell36, DeHt2, RWT152 aimed at studying their morphology internal kinematics. These data are complemented with intermediate-resolution, to describe spectral properties central stars nebulae. The morphokinematical analysis shows that Abell36 consists an inner spheroid two bright point-symmetric arcs; DeHt2 is elliptical protruding polar regions a non-equatorial ring; bipolar....
Aims.We analyse the point-symmetric planetary nebula NGC 6309 in terms of its three-dimensional structure and internal variations physical conditions to deduce processes involved formation.
We present new narrow-band Hα, [N ii], and [O iii] high-resolution images of the quadrupolar planetary nebula NGC 6309 that show in great detail its bipolar lobes reveal morphological features. New high- low-dispersion long-slit spectra have been obtained to help investigation nebular components. The unveil two diffuse blobs, one them located ≃55 arcsec from central star along NE direction (PA = +71°) other at ≃ 78 SW –151°). Therefore, these structures do not share symmetry axes inner...
(Abridged) The origin of hot subdwarf O-type stars (sdOs) remains unclear since their discovery in 1947. Among others, a post-Asymptotic Giant Branch (post-AGB) is possible for fraction sdOs. We are involved comprehensive ongoing study to search and analyze planetary nebulae (PNe) around sdOs with the aim establishing properties post-AGB origin. use deep Halpha [OIII] images detect nebular emission intermediate resolution, long-slit optical spectroscopy detected sdO central stars. These data...
We investigated the origin of Planetary Nebula (PN) M 1–16 using narrow-band optical imaging, and high- low-resolution spectra to perform a detailed morpho-kinematic chemical studies. is revealed be multipolar PN that predominantly emits in [O III ] inner part nebula [N II lobes. A novel spectral unsharp masking technique was applied position-velocity (PV) maps reveal set multiple structures at centre spanning radial velocities from −40 km s −1 20 , with respect systemic velocity. The model...
We present narrow-band [O III]lambda5007 and H-alpha images, as well long-slit high-resolution echelle spectra of the planetary nebula NGC 6058. Our data reveal that 6058 is a multipolar about ~45 arcsec in extent formed by four bipolar outflows are oriented at different position angles. Assuming homologous expansion for all structures, distance 3.5 kpc, we obtain polar velocities around ~68 km s^-1 three them. The estimated kinematical ages suggest oldest have been ejected intervals ~ 1100...
In order to investigate the characteristics and influence of magnetic field in evolved stars, we performed a follow-up investigation our previous submillimeter analysis proto-planetary nebula (PPN) OH 231.8+4.2 (Sabin et al. 2014), this time at 1.3 mm with CARMA facility polarisation mode for purpose multi-scale analysis.OH was observed ∼ 2.5 ′′ resolution detected polarised emission above 3σ threshold (with mean fraction 3.5%).The map indicates an overall organised within nebula.The main...
In this paper we present the results of optical high-resolution imaging and spectroscopy complex planetary nebula (PN) NGC 3242. Our study is based on analysis narrow-band Hα λ6563, [O iii] λ5007, [N ii] λ6584, [S λ6724 Å images, using spectral ranges centred λ6564, λ6583, λ5007 Å. We detected analysed morphological components beyond multiple-shell structure PN, to investigate small-scale aligned towards its major axis (such as knots ansae, well arc-like features) surroundings. Thus,...
We present the first part of an investigation on planetary nebula (PN) PC 22 which focuses use deep imaging and high resolution echelle spectroscopy to perform a detailed morpho-kinematical analysis. is revealed be multipolar PN emitting predominantly in [O III] displaying multiple non-symmetric outflows. Its central region found also particularly inhomogeneous with series low ionization structures (knots) located path The model obtained SHAPE indicates that i) de-projected velocities...
We present narrow-band, broad-band and Wide-field Infrared Survey Explorer (WISE) archive images, high- intermediate-resolution long-slit spectra of K4-37, a planetary nebula that has never been analysed in detail. Although K4-37 appears bipolar, the morphokinematical analysis discloses existence three distinct axes additional particular directions object, indicating is multi-axis probably shaped by several bipolar outflows at different directions. A 4–6 M⊙ main-sequence progenitor estimated...
Aims.Identification of the structural components and analysis internal kinematics in planetary nebula IC 5217.
(Abridged) We present narrow-band images in several emission lines, and high- intermediate-resolution long-slit spectra of Me2-1 to investigate its morphology 3D structure, physical parameters chemical abundances. identified Me2-1: an elliptical ring; two elongated, curved structures (caps) that contain three pairs bright point-symmetric (PS) knots; a shell interior the faint halo or attached shell. The caps are observed all images, PS knots only low-excitation line ones. These also...
IRAS 22568+6141 has been classified as a low-excitation planetary nebula (PN) and presents non-thermal radio continuum emission, which could be signature of nascent PNe. We present intermediate-resolution long-slit spectra obtained in 2021 2023, high-resolution taken light curve at the r filter between 1953 2019. They all reveal changes with timescales decades few years. The object underwent an energetic event around 1990 that suddenly increased its brightness, fading since then. A...
IRAS 22568+6141 has been classified as a low-ionisation planetary nebula (PN) and presents non-thermal radio continuum emission, which could be signature of nascent PNe. We present intermediate-resolution long-slit spectra obtained in 2021 2023, high-resolution taken light curve at the $r$-filter between 1953 2019, that reveal changes with timescales decades few years. The object underwent an energetic event around 1990 suddenly increased its brightness fading since then. A comparison...
We present the first detailed study of bipolar planetary nebula (PN) IPHASX J191104.8$+$060845 (PN G040.6$-$01.5) discovered as part Isaac Newton Telescope Photometric H$\alpha$ Survey Northern Galactic plane (IPHAS). Nordic Optical (NOT) narrow-band images to unveil its true morphology. This PN consists a main cavity with two newly uncovered extended low-surface brightness lobes located towards NW and SE directions. Using near-IR WISE we unveiled presence barrel like structure, which...
Abstract We present an observational study of three oint-ymmetric lanetary ebulae (PS-PNe): PC 19, He 2-429, and 1-1, whose kinematics has been previously reported in the literature. The includes analysis physical conditions chemical abundances. found that abundances 2-429 1-1 correspond to a Peimbert Type I PNe while those 19 are good agreement with IV PN. Kinematic evidence derived from proper motion measurement support classification suggest progenitor star was low-mass low-metallicity...
Water maser emitting planetary nebulae (H$_2$O-PNe) are believed to be among the youngest PNe. We present new optical narrow- and broad-band images, intermediate- high-resolution long-slit spectra, archival images of H$_2$O-PN IRAS 18061--2505. It appears a pinched-waist bipolar PN consisting knotty lobes with some point-symmetric regions, bow-shock near tip each lobe, very compact inner nebula where five components identified in spectra by their kinematic emission properties. The water...
Abstract We present studies using different observational techniques, along frequencies, aiming to resolve and investigate jets, outflows, as well compact innermost regions of asymmetric planetary nebulae (PNe) objects in transition PN. All the information gathered allow us explore kinematics other important properties structures that play a crucial role shaping complex PNe morphologies, particular, we disks/tori collimating engine extreme axisymmetric PNe.