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Astronomy

Unveiling the Secrets of Intermediate-Mass Black Holes

A series of studies sheds light on the origins and characteristics of intermediate-mass black holes.

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The world of black holes has long been divided into three categories: stellar-mass black holes (about five to 50 times the mass of the sun), supermassive black holes (millions to billions of times the mass of the sun), and intermediate-mass black holes with masses somewhere in between. While we know that intermediate-mass black holes should exist, little is known about their origins or characteristics – they are considered the rare “missing links” in black hole evolution.

However, four new studies have shed new light on this mystery. The research was led by a team in the lab of Assistant Professor Karan Jani, who also serves as the founding director of the Vanderbilt Lunar Labs Initiative. The work was funded by the National Science Foundation and the Vanderbilt Office of the Vice Provost for Research and Innovation.

The primary paper, “Properties of ‘Lite’ Intermediate-Mass Black Hole Candidates in LIGO-Virgo’s Third Observing Run,” was published in Astrophysical Journal Letters and led by Lunar Labs postdoctoral fellow Anjali Yelikar and astrophysics Ph.D. candidate Krystal Ruiz-Rocha. The team reanalyzed data from the Nobel-Prize winning Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors in the U.S. and the Virgo detector in Italy.

The researchers found that these waves corresponded to mergers of black holes greater than 100 to 300 times the mass of the sun, making them the heaviest gravitational-wave events recorded in astronomy. “Black holes are the ultimate cosmic fossils,” Jani said. “The masses of black holes reported in this new analysis have remained highly speculative in astronomy. This new population of black holes opens an unprecedented window into the very first stars that lit up our universe.”

Earth-based detectors like LIGO capture only a split second of the final collision of these “lightweight” intermediate-mass black holes, making it challenging to determine how the universe creates them. To tackle this, Jani’s lab turned to the upcoming European Space Agency and NASA’s Laser Interferometer Space Antenna (LISA) mission, launching in the late 2030s.

In two additional studies published in Astrophysical Journal, “A Sea of Black Holes: Characterizing the LISA Signature for Stellar-origin Black Hole Binaries,” led by Ruiz-Rocha, and “A Tale of Two Black Holes: Multiband Gravitational-wave Measurement of Recoil Kicks,” led by former summer research intern Shobhit Ranjan, the team showed LISA can track these black holes years before they merge, shedding light on their origin, evolution, and fate.

Detecting gravitational waves from black hole collisions requires extreme precision – like trying to hear a pin drop during a hurricane. In a fourth study also published in Astrophysical Journal, “No Glitch in the Matrix: Robust Reconstruction of Gravitational Wave Signals under Noise Artifacts,” the team showcased how artificial intelligence models guarantee that signals from these black holes remain uncorrupted from environmental and detector noise in the data. The paper was led by postdoctoral fellow Chayan Chatterjee and expands upon Jani’s AI for New Messengers Program, a collaboration with the Data Science Institute.

“We hope this research strengthens the case for intermediate-mass black holes as the most exciting source across the network of gravitational-wave detectors from Earth to space,” Ruiz-Rocha said. “Each new detection brings us closer to understanding the origin of these black holes and why they fall into this mysterious mass range.”

Moving forward, Yelikar said the team will explore how intermediate-mass black holes could be observed using detectors on the moon.

“Access to lower gravitational-wave frequencies from the lunar surface could allow us to identify the environments these black holes live in – something Earth-based detectors simply can’t resolve,” she said.

In addition to continuing this research, Jani will also be working with the National Academies of Sciences, Engineering, and Medicine on a NASA-sponsored study to identify high-value lunar destinations for human exploration to address decadal-level science objectives. As part of his participation in this study, Jani will be contributing to the Panel on Heliophysics, Physics, and Physical Science, to identify and articulate the science objectives related to solar physics, space weather, astronomy, and fundamental physics that would be most enabled by human explorers on the moon.

“This is an exciting moment in history – not just to study black holes, but to bring scientific frontiers together with the new opportunity of training the next generation of students whose discoveries will be shaped by, and made from, the moon,” Jani said.

Astronomy

Hubble Captures a Dazzling Star-Birthing Storm 160,000 Light-Years Away

Hubble’s latest portrait of the Tarantula Nebula reveals a turbulent star-making region far beyond the Milky Way. Located 160,000 light-years away in the Large Magellanic Cloud, this cosmic expanse is home to some of the most massive stars ever discovered—up to 200 times the Sun’s mass. The image captures intricate dust clouds, intense stellar winds from rare Wolf–Rayet stars, and the extraordinary chaos that fuels the birth of new suns.

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Get ready to be amazed by one of the most incredible sights in the universe! The NASA/ESA Hubble Space Telescope has captured a breathtaking picture of the star-forming region known as the Tarantula Nebula. But what’s truly remarkable about this stunning image is that it’s not even located within our own galaxy, the Milky Way. Instead, it resides 160,000 light-years away in the Large Magellanic Cloud, a dwarf galaxy nestled in the constellations Dorado and Mensa.

The Tarantula Nebula is like a cosmic factory, churning out new stars at an incredible rate. It’s the largest and brightest star-forming region not just in the Large Magellanic Cloud but also in our entire local group of galaxies. This nebula is home to some of the most massive stars known, with some being roughly 200 times as massive as our Sun.

The Hubble Space Telescope has taken a detailed image of this cosmic wonder, revealing incredible sculptural details in its dusty clouds. The scene captured by Hubble is located away from the center of the nebula, where there’s a super star cluster called R136. But very close to this cluster lies a rare type of star called a Wolf-Rayet star.

Wolf-Rayet stars are extremely hot and luminous, with dense and furious stellar winds that power their massive energy output. The Tarantula Nebula is a frequent target for Hubble, thanks to its multiwavelength capabilities, which allow it to capture the intricate details in the nebula’s dusty clouds.

The data used to create this image come from an observing program called Scylla, named after a multi-headed sea monster from Greek mythology. The Scylla program was designed to complement another Hubble observing program called ULLYSSES (Ultraviolet Legacy Library of Young Stars as Essential Standards). While ULLYSSES targets massive young stars in the Small and Large Magellanic Clouds, Scylla investigates the structures of gas and dust that surround these stars.

This stunning image of the Tarantula Nebula serves as a reminder of the awe-inspiring beauty and mystery that lies just beyond our galaxy. It’s a testament to the power of Hubble to capture and reveal the intricate details of our universe, even in the most distant reaches of space.

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Astronomy

A Star That Defied Death: The Supernova Survivor

In a spectacular image captured by the Hubble Space Telescope, the spiral galaxy NGC 1309 glows with cosmic elegance and hides a strange survivor.

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The story of a star that survived its own supernova explosion is one of cosmic resilience. Located within the Milky Way galaxy, this remarkable star shone even brighter after being struck by a massive explosion in 2012. Its journey to becoming a supernova survivor began thousands of years ago, and it has captivated scientists ever since.

The spiral galaxy NGC 1309, situated about 100 million light-years away in the constellation Eridanus, is home to this incredible star. In stunning images captured by the NASA/ESA Hubble Space Telescope, the galaxy reveals its intricate details: bluish stars, dark brown gas clouds, and a pearly white center. The image also showcases hundreds of distant background galaxies, each one a cosmic wonder in its own right.

The remarkable story of this supernova survivor begins with two significant events: SN 2002fk in 2002 and SN 2012Z in 2012. While the first event was a perfect example of a Type Ia supernova, which occurs when the core of a dead star (a white dwarf) explodes, the second event was different – it was classified as a Type Iax supernova.

Unlike its Type Ia counterpart, SN 2012Z did not completely destroy the white dwarf, leaving behind a ‘zombie star’ that shone even brighter than before. This phenomenon has never been observed before, and scientists have used Hubble observations to study this extraordinary event in detail.

In fact, these observations also made it possible to identify the white dwarf progenitor of a supernova for the first time ever, providing valuable insights into the cosmic processes that shape our universe. The story of this star’s survival is a testament to the awe-inspiring power and complexity of the cosmos.

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Astronomy

The Cosmic Dance: An Ultra-Hot Jupiter’s Imminent Demise May Reveal Secrets of Rocky World Formation

A massive, fast-orbiting planet is inching closer to its star, and scientists now have direct evidence of its impending demise. It could disintegrate, burn up, or be stripped bare, offering rare clues into how planetary systems evolve.

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The discovery of an ultra-hot Jupiter exoplanet named TOI-2109b has left astronomers on high alert, as this extreme planet is now spiraling towards its star at a breakneck pace. Located a staggering 870 light-years from Earth, this gargantuan gas giant completes an orbit around its star in just 16 hours – a record that makes it the closest hot Jupiter ever discovered.

“We’re witnessing a cosmic death dance,” says Dr. Jaime A. Alvarado-Montes, a Macquarie Research Fellow who led the international study published on July 15 in The Astrophysical Journal. “TOI-2109b is super-close to its star, and its mass is nearly five times that of Jupiter. It’s like Mercury’s mass, but it takes just 16 hours for this huge gas giant to orbit its star.”

The team analyzed transit timing data from multiple ground-based telescopes, NASA’s TESS mission, and the European Space Agency’s CHEOPS satellite spanning 2010 to 2024. The results revealed subtle changes in the planet’s orbit, confirming that TOI-2109b may be spiraling towards its star.

The researchers have identified three possible fates for this doomed exoplanet: it could be torn apart by tidal forces, plunge directly into its star, or have its gaseous envelope stripped away by intense radiation, leaving only a rocky core. This cataclysmic event could provide valuable insights into the mysteries of planetary evolution and the formation of rocky worlds.

The study suggests that some rocky planets in other solar systems might be the stripped cores of former gas giants – a possibility that could reshape our understanding of planetary evolution. As astronomers continue to monitor TOI-2109b over the next three to five years, they will detect the predicted orbital changes, providing real-time observation of a planetary system in its death throes.

This remarkable discovery has left scientists on high alert, and it’s only a matter of time before we witness the impending doom of this ultra-hot Jupiter. As we gaze into the cosmos, we are reminded that there is still so much to learn about our universe and its many secrets waiting to be uncovered.

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